Re: [NTG-context] Math literal colon
On 24 Jul 2015, at 11:40, Hans Hagen pra...@wxs.nl wrote:
On 7/20/2015 6:09 PM, Hans Aberg wrote:
On 20 Jul 2015, at 17:50, Manuel Blanco manue...@ucm.es wrote:
A little bit more of intelligence can be given with
\begingroup\lccode`\~=`\:\lowercase{\endgroup
\unexpanded\def~}{\futurelet\tmptoken\docolon}
\unexpanded\def\docolon{\ifx=\tmptoken\mathrel{\mathop{\mathchar`\:}}\else\colon\fi}
\mathcode`\:=8000 %
That lets you do $f: A \to B$ and $f(x) := x^2$
For the second, one can use ≔ COLON EQUALS U+2254. But it is a good point,
though.
there is actually a more modern trick:
\starttext
\startluacode
characters.mathpairs[0x3A] = { [0x3D] = 0x2254 }
characters.mathpairs[0x3E] = { [0x3D] = 0x2265 }
characters.mathpairs[0x3C] = { [0x3D] = 0x2264 }
characters.mathpairs[0x3D] = { [0x3A] = 0x2255 }
\stopluacode
\startTEXpage
$a := b = = c =: d = e$
\stopTEXpage
\stoptext
I have experimented with a theorem proof assistant that admitted parallel ASCII
and Unicode symbol names, but it turns out to be complicated. Think of C/C++
trigraphs, a chore to implement, only to be removed in the latest standards.
So I think one should only focus on UTF-8, and add TeX ASCII “\” commands as a
complement.
One problem with this approach is the lack of Unicode input methods. But that
may coming.
For example, instead having “:=“ in the input file and let Lua translate it,
one can merely type it and let the text editor translate it ≔ COLON EQUALS
U+2254.
It will save a lot of programming time, at least on the ConTEXt project. :-)
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Re: [NTG-context] Math literal colon
On 24 Jul 2015, at 11:43, Hans Hagen pra...@wxs.nl wrote:
On 7/20/2015 6:22 PM, Hans Aberg wrote:
On 20 Jul 2015, at 17:43, Manuel Blanco manue...@ucm.es wrote:
Well, you can make the colon active in math mode and then let it output
\colon.
This is a TeX way, I don't know if there's a ConTeXt way for this:
\begingroup\lccode`\~=`\:\lowercase{\endgroup
\let~}\colon
\mathcode`\:=8000 %
For some reason, the colon in ConTeXt is larger relative LuaTeX.
you probably mean latex (macro package) here as luatex (engine) itself
doesn't do anything
keep in mind that context implements much of math in a complete different
way, so solutions for problems or wishes are done differently too; in this
case we try to use unicode and some lua magic instead of character juggling
at the tex end
we also need to keep in mind that characters have to behave well in tagged
pdf and exports and so
In the examples I mentioned (below), running ‘context’ on the first produces
large colons, whereas ‘luatex’ on the second does not. The latter looks right
to me.
There is a similar issue with integral symbols, where somehow ConTeXt add
additional spacing after it.
http://www.ntg.nl/pipermail/ntg-context/2015/082541.html
— context —
\setupbodyfont[xits,10pt]
\setupformulas[location=left]
\begingroup\lccode`\~=`\:\lowercase{\endgroup
\let~}\colon
\mathcode`\:=8000 %
\starttext
The function $f: A → B$, $g\colon A → B$.
\stoptext
—
— luatex —
\begingroup\lccode`\~=`\:\lowercase{\endgroup
\let~}\colon
\mathcode`\:=8000 %
The function $f: A \to B$.
\end
—
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Re: [NTG-context] Math literal colon
On 24 Jul 2015, at 15:34, Hans Hagen pra...@wxs.nl wrote: I have experimented with a theorem proof assistant that admitted parallel ASCII and Unicode symbol names, but it turns out to be complicated. Think of C/C++ trigraphs, a chore to implement, only to be removed in the latest standards. So I think one should only focus on UTF-8, and add TeX ASCII “\” commands as a complement. One problem with this approach is the lack of Unicode input methods. But that may coming. For example, instead having “:=“ in the input file and let Lua translate it, one can merely type it and let the text editor translate it ≔ COLON EQUALS U+2254. that is ok for some input sequences (this kind of input translation happens for accented characters and some math like negated symbols) but replacing = in the input is bad as it is only meaningful in math and not all input is math (and unicode lacks script/language tagging); keep in mind that 'verbatim' in tex really means verbatim and input translation contradicts that I have only the part that is used to produce math character output here, and it would be better to have it in the key map. But somehow, it would be possible to produce those Unicode characters. Right, there is a lot copy and paste, but it is slow. It will save a lot of programming time, at least on the ConTEXt project. :-) not really as that code is already in place for years; in this case it mainly boils down to adding some extra entries in the character database (and this code is simple compared to other code so not much to save here) You can add it if you think it is no problem. Proper Unicode characters in the input help the readability, so putting them at high priority seems good. ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Math literal colon
On 24 Jul 2015, at 16:26, Hans Hagen pra...@wxs.nl wrote:
On 7/24/2015 4:08 PM, Hans Aberg wrote:
I was thinking of just having the two, \colon and \ratio. Looking into some
books before electronic typesetting, the spacing of the latter can vary
widely: some do not use spaces at all. So a set might look
{x:x a}
instead of
{x : x a}
But that would be a typographical issue, rather than semantic.
but we do need to deal with the typographic issue
Yes, that is what I meant, typographic adjustments on top.
and unicode is not covering every symantic (otherwise we would have more)
It covers all standard symbols at the end of 1990s. Since then a number of
symbols have come into use. There was a discussion about that on the Unicode
list. Those using them might add them as well. But new characters are created,
so there is a need for accessing them as well.
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Re: [NTG-context] Math literal colon
On 24 Jul 2015, at 16:28, Hans Hagen pra...@wxs.nl wrote: On 7/24/2015 4:13 PM, Hans Aberg wrote: You can add it if you think it is no problem. Proper Unicode characters in the input help the readability, so putting them at high priority seems good. fyi, on the agenda for the gyre font project is to have a monospaced font that has most of unicode math so that we can have decent editing (once we have the funding covered) The Unicode monospace characters were added by mistake, because in computer science, style does not affect semantics, as it does math. Looking into old computer science books, they do not have monospace, and a I recall a Pascal compiler on Mac OS 9 that used styled, non-monospace fonts. So a monospace font may not be strictly necessary, though current UTF-8 plain text does not look good. In Xcode, part of the reason is that one cannot choose font per Unicode code point segments. ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Math literal colon
On 24 Jul 2015, at 15:48, Hans Hagen pra...@wxs.nl wrote:
In the examples I mentioned (below), running ‘context’ on the first produces
large colons, whereas ‘luatex’ on the second does not. The latter looks
right to me.
define 'luatex' ... it's all about choices that macro packages make (or made
in the past)
I use Tex Live 2015 that came last month.
$ luatex --version
This is LuaTeX, Version beta-0.80.0 (TeX Live 2015) (rev 5238)
There is a similar issue with integral symbols, where somehow ConTeXt add
additional spacing after it.
http://www.ntg.nl/pipermail/ntg-context/2015/082541.html
— context —
\setupbodyfont[xits,10pt]
\setupformulas[location=left]
\begingroup\lccode`\~=`\:\lowercase{\endgroup
\let~}\colon
\mathcode`\:=8000 %
\starttext
The function $f: A → B$, $g\colon A → B$.
we could add a mathsymbol entry but I leave that to Aditya to decide
{
adobename=colon,
category=po,
cjkwd=na,
description=COLON,
direction=cs,
linebreak=is,
mathclass=relation,
--mathsymbol=0x2236,
unicodeslot=0x3A,
},
Should it be 'mathclass=“relation”’? Mathematically, relations have extra space
at both sides, whereas in the function $f: A → B$, there should not be much
space before the “:”.
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Re: [NTG-context] Math literal colon
On 24 Jul 2015, at 21:58, Hans Hagen pra...@wxs.nl wrote: On 7/24/2015 6:57 PM, Hans Aberg wrote: The Unicode monospace characters were added by mistake, because in computer science, style does not affect semantics, as it does math. Looking into old computer science books, they do not have monospace, and a I recall a Pascal compiler on Mac OS 9 that used styled, non-monospace fonts. So a monospace font may not be strictly necessary, though current UTF-8 plain text does not look good. In Xcode, part of the reason is that one cannot choose font per Unicode code point segments. we're not talking of the monospace math alphabet (those are already covered but the fonts) but about a monospaced font for editing and verbatim (handy for manuals explaining math typesetting) Right. But it was added because it is popular in computer science to use a monospace font, though not strictly necessary from the semantic point of view. one extra alphabet is not putting that much of a burden on tex; It is more a curiosity, the reason they were added. It might be useful some day, say using bold monospace for keywords in programming languages. It reminds me, in math one can use the idea that upright for constants, italic for variables. But I think in LaTeX packages mathtools and/or unicode-math, it is difficult to do that in UTF-8, because the somehow translates them to italic. And the Unicode sans-serif mathematical styles aren’t really semantic either from the mathematical point of view, but there is a technical standard to set tensors in sans-serif, and perhaps were added because of that. Physics books seem to be bit chaotic here. In pure math, it is all serif. let's hope math coders don't start using the many emoticons and alike that unicode provides From the Unicode list discussion, I think there was a fairly large number of additional symbols the poster wanted to be added. But it took a long time, via STIX, the get the current ones usable. But as you note, any character could be in principle be used. That is how many started off. So it makes me think that, instead of a monospace font for all the math characters, one might switch to a variable-width font in the input code, as actuallye been the case in the past. which is actually rather inconvenient for entering tables (and i'd also never use it for programming) Indeed, but that is the only use. The obsession in computer code to align vertically. All that monospace tabbing will break, that is for sure. right and proportial makes debugging hard (and how about blockwise copying) So possibly, there should be some replacement when using a variable width font. For the ASCII tabbing, the tab character was originally typically interpreted as being 8 spaces wide, but that is too much for computer code with higher indentation levels. So people switched using spaces instead, successively shrinking down to 2 spaces instead of tab, which is what I use. Unicode has a number of tab characters, but haven’t seen them in use. ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Math literal colon
On 24 Jul 2015, at 18:34, Hans Hagen pra...@wxs.nl wrote: On 7/24/2015 6:18 PM, Hans Aberg wrote: On 24 Jul 2015, at 16:28, Hans Hagen pra...@wxs.nl wrote: On 7/24/2015 4:13 PM, Hans Aberg wrote: You can add it if you think it is no problem. Proper Unicode characters in the input help the readability, so putting them at high priority seems good. fyi, on the agenda for the gyre font project is to have a monospaced font that has most of unicode math so that we can have decent editing (once we have the funding covered) The Unicode monospace characters were added by mistake, because in computer science, style does not affect semantics, as it does math. Looking into old computer science books, they do not have monospace, and a I recall a Pascal compiler on Mac OS 9 that used styled, non-monospace fonts. So a monospace font may not be strictly necessary, though current UTF-8 plain text does not look good. In Xcode, part of the reason is that one cannot choose font per Unicode code point segments. we're not talking of the monospace math alphabet (those are already covered but the fonts) but about a monospaced font for editing and verbatim (handy for manuals explaining math typesetting) Right. But it was added because it is popular in computer science to use a monospace font, though not strictly necessary from the semantic point of view. So it makes me think that, instead of a monospace font for all the math characters, one might switch to a variable-width font in the input code, as actuallye been the case in the past. All that monospace tabbing will break, that is for sure. ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Math literal colon
On 24 Jul 2015, at 16:29, Hans Hagen pra...@wxs.nl wrote:
On 7/24/2015 4:19 PM, Hans Aberg wrote:
The function $f: A → B$, $g\colon A → B$.
we could add a mathsymbol entry but I leave that to Aditya to decide
{
adobename=colon,
category=po,
cjkwd=na,
description=COLON,
direction=cs,
linebreak=is,
mathclass=relation,
--mathsymbol=0x2236,
unicodeslot=0x3A,
},
Should it be 'mathclass=“relation”’? Mathematically, relations have extra
space at both sides, whereas in the function $f: A → B$, there should not be
much space before the “:”.
that's where the domain would kick in .. it can control that kind of spacing
issues
OK. The word “relation” makes me think of math relations. :-)
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Re: [NTG-context] Math literal colon
On 24 Jul 2015, at 15:29, Hans Hagen pra...@wxs.nl wrote:
On 7/24/2015 2:32 PM, Hans Aberg wrote:
[Note: I use the cc to know that I have received a reply.]
On 24 Jul 2015, at 10:30, Hans Hagen pra...@wxs.nl wrote:
On 7/20/2015 6:06 PM, Hans Aberg wrote:
On 20 Jul 2015, at 16:40, Aditya Mahajan adit...@umich.edu wrote:
On Mon, 20 Jul 2015, Hans Aberg wrote:
The LaTeX package unicode-math has an option colon=literal, which makes
it behave as in math functions (as in example below). Has ConTeXt a
similar option?
No. You have to use \colon.
It would be nice with such an option, as it helps the readability of the
input files.
already for some years i'm thinking of something similar to openmath
dictionaries i.e. in many cases when one writes math it is in some field
that is consistent within a document, say logic or engineering
it is rather trivial to support something
\setupmathematics[domain=logic]
or so, where we automatically relate the math class with the symbols used,
something that becomes more important once we start coding in unicode
instead of using names
but ... in order to provide this, i need information about useful categories
Unicode provides one such category. The reason is all math characters are
added and in that process analyzed. I worked with Taco on that in the late
1990s.
So one main option, which might be the simplest, to assume that the input is
UTF-8. Oen can the added ASCII command names, based on the Unicode names. In
addition some options for special needs and legacy.
i don't understand what you mean as the issue is not unicode or ascii but
categorizing symbols in classes
Right, but that has in part already been done by Unicode. It is not really
possible to classify math symbols from the the mathematical point of view, as
every author in principle use their own notation.
when we have a symbol in the input (can be a : but also something else) in
some cases it is a binary but in other cases a relation or whatever
Right. When TeX was written, there was only ASCII, so Knuth set “:” to the
ratio binary operator, and the function “:” to \colon.
Now, when Unicode is available, it sets the ratio binary operator to ≔ COLON
EQUALS U+2254, leaving : COLON U+003A open for other uses. So set the latter to
\colon, and add a command \ratio for the former.
this influences the spacing and the 'domain' (or dictionaries) group symbols
so that we can assign the right properties
entering a utf sequence representing 0x2236 still doesn't always prescribe
what mathclass it is, 0x22A5 0x22C5 0x25B3 are examples of such dual face
characters
(this is actually more important in for instance xml input)
I was thinking of just having the two, \colon and \ratio. Looking into some
books before electronic typesetting, the spacing of the latter can vary widely:
some do not use spaces at all. So a set might look
{x:x a}
instead of
{x : x a}
But that would be a typographical issue, rather than semantic.
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Re: [NTG-context] Math literal colon
[Note: I use the cc to know that I have received a reply.] On 24 Jul 2015, at 10:30, Hans Hagen pra...@wxs.nl wrote: On 7/20/2015 6:06 PM, Hans Aberg wrote: On 20 Jul 2015, at 16:40, Aditya Mahajan adit...@umich.edu wrote: On Mon, 20 Jul 2015, Hans Aberg wrote: The LaTeX package unicode-math has an option colon=literal, which makes it behave as in math functions (as in example below). Has ConTeXt a similar option? No. You have to use \colon. It would be nice with such an option, as it helps the readability of the input files. already for some years i'm thinking of something similar to openmath dictionaries i.e. in many cases when one writes math it is in some field that is consistent within a document, say logic or engineering it is rather trivial to support something \setupmathematics[domain=logic] or so, where we automatically relate the math class with the symbols used, something that becomes more important once we start coding in unicode instead of using names but ... in order to provide this, i need information about useful categories Unicode provides one such category. The reason is all math characters are added and in that process analyzed. I worked with Taco on that in the late 1990s. So one main option, which might be the simplest, to assume that the input is UTF-8. Oen can the added ASCII command names, based on the Unicode names. In addition some options for special needs and legacy. ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
[NTG-context] Math literal colon
The LaTeX package unicode-math has an option colon=literal, which makes it
behave as in math functions (as in example below). Has ConTeXt a similar
option?
lualatex
\documentclass[leqno]{article}
\usepackage[colon=literal]{unicode-math}
\begin{document}
The function $f: A → B$.
\end{document}
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Re: [NTG-context] Math literal colon
On 20 Jul 2015, at 16:40, Aditya Mahajan adit...@umich.edu wrote: On Mon, 20 Jul 2015, Hans Aberg wrote: The LaTeX package unicode-math has an option colon=literal, which makes it behave as in math functions (as in example below). Has ConTeXt a similar option? No. You have to use \colon. It would be nice with such an option, as it helps the readability of the input files. ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Math literal colon
On 20 Jul 2015, at 17:50, Manuel Blanco manue...@ucm.es wrote:
A little bit more of intelligence can be given with
\begingroup\lccode`\~=`\:\lowercase{\endgroup
\unexpanded\def~}{\futurelet\tmptoken\docolon}
\unexpanded\def\docolon{\ifx=\tmptoken\mathrel{\mathop{\mathchar`\:}}\else\colon\fi}
\mathcode`\:=8000 %
That lets you do $f: A \to B$ and $f(x) := x^2$
For the second, one can use ≔ COLON EQUALS U+2254. But it is a good point,
though.
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Re: [NTG-context] Math literal colon
On 20 Jul 2015, at 17:43, Manuel Blanco manue...@ucm.es wrote:
Well, you can make the colon active in math mode and then let it output
\colon.
This is a TeX way, I don't know if there's a ConTeXt way for this:
\begingroup\lccode`\~=`\:\lowercase{\endgroup
\let~}\colon
\mathcode`\:=8000 %
For some reason, the colon in ConTeXt is larger relative LuaTeX.
Also, it seems that “\:” is not used for anything - error in luatex, and empty
in context. So it might be used for the infix operator.
— context —
\setupbodyfont[xits,10pt]
\setupformulas[location=left]
\begingroup\lccode`\~=`\:\lowercase{\endgroup
\let~}\colon
\mathcode`\:=8000 %
\starttext
The function $f: A → B$, $g\colon A → B$.
\stoptext
—
— luatex —
\begingroup\lccode`\~=`\:\lowercase{\endgroup
\let~}\colon
\mathcode`\:=8000 %
The function $f: A → B$.
—
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Re: [NTG-context] Math literal colon
On 20 Jul 2015, at 18:37, Aditya Mahajan adit...@umich.edu wrote:
On Mon, 20 Jul 2015, Hans Aberg wrote:
On 20 Jul 2015, at 16:40, Aditya Mahajan adit...@umich.edu wrote:
On Mon, 20 Jul 2015, Hans Aberg wrote:
The LaTeX package unicode-math has an option colon=literal, which makes it
behave as in math functions (as in example below). Has ConTeXt a similar
option?
No. You have to use \colon.
It would be nice with such an option, as it helps the readability of the
input files.
There are two uses of colon in math, as a relation (in sets \{ x : f(x) = 0
\} and in ratios A:B, etc) and as a punctuation ($f \colon A - B, etc.[1]).
Only one of them can be mapped to the literal :, the other must use a macro
name. Knuth chose to map : to the relation and mapped \colon to a punctuation
and every other macro package follows that convention.
Right. Perhaps he didn’t use functions much. :-)
It is easy to change the mapping, but if the mapping is reversed, is there is
standard name for : as a relation?
It seems that “\:” might be used. I get an error when trying to use it in
luatex. But note:
In pure math, “:” is also used for projective coordinates, it does not seem to
have operator spaces around them. This is what I think is the right look:
https://en.wikipedia.org/wiki/Homogeneous_coordinates#Notation
There is also Unicode ∶ RATIO U+2236.
So a proposal might be to keep \colon, and make a new \ratio for those that
want to use the operator : in ASCII. The : without spaces might perhaps be
called \proj or something.
Looking at
https://en.wikipedia.org/wiki/Mathematical_Operators
a UTF-8 mapping would be sending U+2236 to \ratio, the operator :. There is no
special colon for the other uses, function and projective coordinates, it seems.
So the \: might be mapped to \proj or \ratio according to taste.
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Re: [NTG-context] Math literal colon
On 20 Jul 2015, at 18:37, Aditya Mahajan adit...@umich.edu wrote: It is easy to change the mapping, but if the mapping is reversed, is there is standard name for : as a relation? Looking into a book on algebraic geometry, it seems fine to use operator : for projective coordinates. So skip the variation without spaces then. Then one might use two short commands : and \: that correspond, by an option, to \colon and \ratio. Unicode ∶ RATIO U+2236 should always be operator :, i.e. \ratio, then, though. ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Math literal colon
On 20 Jul 2015, at 18:37, Aditya Mahajan adit...@umich.edu wrote:
On Mon, 20 Jul 2015, Hans Aberg wrote:
It would be nice with such an option, as it helps the readability of the
input files.
There are two uses of colon in math, as a relation (in sets \{ x : f(x) = 0
\} and in ratios A:B, etc) and as a punctuation ($f \colon A - B, etc.[1]).
Only one of them can be mapped to the literal :, the other must use a macro
name.
It is easy to change the mapping, but if the mapping is reversed, is there is
standard name for : as a relation?
It might be simplest to align towards Unicode and UTF-8, while retaining ASCII
commands, avoiding a plethora of options:
So one has the commands \colon for function “: as is now, and the new \ratio
for operator “:.
Then Unicode ∶ RATIO U+2236 is mapped to the same as \ratio, which leaves :
COLON U+003A the only possibility to be the same as \colon.
Such an option might be called say colon=unicode, and be a part other similar
options.
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Re: [NTG-context] Math literal colon
On 20 Jul 2015, at 21:34, Manuel Blanco manue...@ucm.es wrote: I'm not sure I understand what you mean. It's true that the colon used in \colon differs from the one used if you input : directly by default (it's smaller). Right. For some reason, your code gives the right, smaller, colon when used with luatex, but not with context. (As in the examples I gave.) ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Math literal colon
On 20 Jul 2015, at 21:34, Manuel Blanco manue...@ucm.es wrote: The definition of a coordinate separator should be with \mathpunct, although it doesn't look particularly good, so may be better to use no space at all (as commented in other mails). In the case of \ratio, since it's a binary operator, it should be \mathbin; but may be that's too much space and tighter spacing would be better. Strictly speaking, the coordinate separator : for homogeneous coordinates is a ration symbol, and a book in algebraic used that. So may be simplest to only do the operator : along with the function and set :. ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Math alignment
On 7 Jul 2015, at 16:47, Wolfgang Schuster schuster.wolfg...@gmail.com
wrote:
I get errors when using \MC - see example below.
The \NR before \stopmathcases is missing in all your examples.
OK. Though I know it, it is hard to get used to, coming from LaTeX.
But the spacing is wrong: too much between the two components. These are not
cases, but aligned formulas: one might have a number of alignments, not just
one. And I just happen to use left braces on them.
Take a look at my previous example where I changed the distance between both
columns with the distance key.
I missed that. It fixes the spaces within the formula, but adds space between
the two sets relative both TeX and AMS-LaTeX (which has about the same as TeX),
cf. example below.
In AMS-LaTeX one can have more than one alignment, though when trying it
between the “-“ and the “ω” in the second (right-most) set, it adds a lot of
space, rather than just trying to align a compactly as possible. In ConTeXt,
nothing happens with extra alignments; in TeX, there is an error.
So using \startmathcases is a workaround: trying to force it to do something it
wasn’t intended for.
\starttext
\def\equlb#1{\left\{\eqalign{#1}\right.} %equation left braced
\startformula
J^j:\startmathcases[distance=\spaceamount]\NC ω^0 \MC ↦ 0 \NR \NC ω^j \MC ↦ 0
\NR \stopmathcases \quad
\startmathcases[distance=\spaceamount] \NC ω^k \MC ↦ \MC ω^l \NR \NC ω^l \MC
↦ -\MC ω^k \NR \stopmathcases
\stopformula
\startformula
J^j:\equlb{ω^0 ↦ 0 \cr ω^j ↦ 0} \quad
\equlb{ω^k ↦ ω^l \cr ω^l ↦ -ω^k} \stopformula
\stoptext
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Re: [NTG-context] Math alignment
On 7 Jul 2015, at 04:46, Wolfgang Schuster schuster.wolfg...@gmail.com wrote: The spacing is different in cases - TeX also has such a variation. Specifically, there is extra space before the conditionals. In addition, it seems \startmathcases ... \stopmathcases is not working with UTF-8: in the example below, the ω’s on the second line, after the arrows, disappear in my PDF. This is explained in section 8 of the document: FYI, the TeX Live 2015 version from 2007 called context-latex-math.pdf does not have ch. 8. There are two ways of specifying the second column — \MC (Math Column) and \NC (New Column). If \MC is used, the second column is in \math mode, with \NC it is in ‘text mode’. I get errors when using \MC - see example below. But the spacing is wrong: too much between the two components. These are not cases, but aligned formulas: one might have a number of alignments, not just one. And I just happen to use left braces on them. \starttext \startformula J^j:\startmathcases\NC ω^0 \MC → 0 \NR \NC ω^j \MC → 0 \stopmathcases \quad \startmathcases \NC ω^k \MC → ω^l \NR \NC ω^l \MC → -ω^k \stopmathcases \stopformula \stoptext ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
[NTG-context] Environments
ConTeXt does not seem to have LaTeX style environments. FYI, for the latter, I developed [1] a long time ago more advanced ones: The environments admit hooks, i.e., code executed before and after the local group. The name can be omitted in the closing, which works also when using one environment to define a new. And a more compact syntax. 1. https://secure2.storegate.com/Shares/Home.aspx?ShareID=db8465b3-112f-4194-8909-1d42ff149e32 Compile 'lualatex test0.tex’. ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Math alignment
On 7 Jul 2015, at 20:17, Wolfgang Schuster schuster.wolfg...@gmail.com
wrote:
You can set the alignment for each column in a matrix with the align key.
\definemathmatrix
[aligned]
[n=2,
align={right,left},
distance=\spaceamount]
\starttext
\startformula
J^j:
\startaligned[left=\left\{,right=\right.]
\NC ω^0 \NC ↦ 0 \NR
\NC ω^j \NC ↦ 0 \NR
\stopaligned
\quad
\startaligned[n=3,align={right,middle,left},left=\left\{,right=\right.]
\NC ω^k \NC ↦ \NC ω^l \NR
\NC ω^l \NC ↦ \NC -ω^k \NR
\stopaligned
\stopformula
\stoptext
That looks like the right thing. Thanks.
Your example is quite close to TeX, cf. example below.
I have also put in an extra alignment to see what happens, monospace code
alignment style. Changing ‘left’ to ‘right did not seem to have any effect here.
\definemathmatrix
[aligned]
[n=2,
align={right,left},
distance=\spaceamount]
\starttext
\startformula
J^j:
\startaligned[left=\left\{,right=\right.]
\NC ω^0 \NC ↦ 0 \NR
\NC ω^j \NC ↦ 0 \NR
\stopaligned
\quad
\startaligned[n=3,align={right,middle,left},left=\left\{,right=\right.]
\NC ω^k \NC ↦ \NC \NC ω^l \NR
\NC ω^l \NC ↦ \NC -\NC ω^k \NR
\stopaligned
\stopformula
\def\equlb#1{\left\{\eqalign{#1}\right.} %equation left braced
\startformula
J^j:\equlb{ω^0 ↦ 0 \cr ω^j ↦ 0} \quad
\equlb{ω^k ↦ ω^l \cr ω^l ↦ -ω^k} \stopformula
\stoptext
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Re: [NTG-context] Math alignment
On 7 Jul 2015, at 21:49, Wolfgang Schuster schuster.wolfg...@gmail.com
wrote:
You should google for mathalign.pdf which explains and shows examples for the
matrix, cases etc. environments.
To get the same result as your LaTeX example you can use the m key for
\startalign.
\starttext
\startformula
\startalign[m=3,distance=3em]
\NC K \NC \approx G * H\NC i \NC = j+k
\NC B \NC \subset C \NR
\NC H \NC \approx A_{0}*B_{0} \NC i' \NC = j'+k'
\NC C \NC = D\cap E \NR
\NC G \NC \approx \coprod_{\alpha\in A} L_{\alpha} \NC i'' \NC =j''+k''
\NC A \NC = D \cup E \NR
\stopalign
\stopformula
\stoptext
That is where I started - it does not work with \left\{ … \right. :-)
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Re: [NTG-context] Math alignment
On 7 Jul 2015, at 20:17, Wolfgang Schuster schuster.wolfg...@gmail.com
wrote:
You can set the alignment for each column in a matrix with the align key.
FYI, the document amshelp.pdf says that AMS-LaTeX environments align, align*,
and aligned, can have multiple alignments, and gives this example:
\begin{align*}
K \approx G * H i= j+k B \subset C\\
H \approx A_{0}*B_{0} i’= j’+k’ C = D\cap E\\
G \approx \coprod_{\alpha\in A} L_{\alpha} i’’=j’’+k’’ A = D \cup E
\end{align*}
which is typeset so that 'K \approx G * H’ is one equation aligned on the ‘’
with the others below, followed by 'i= j+k’ in the next column.
So the ampersands have multiple functions here, it seems: alignment and
separating columns.
Translating into ConTeXt, one might have (pseudocode):
\startformula
\startalign
\NC K \NA \approx G * H \NC i\NA= j+k \NC B \NA \subset C \NR
\NC H \NA \approx A_{0}*B_{0} \NC i’\NA= j’+k’ \NC C \NA = D\cap E\NR
\NC G \NA \approx \coprod_{\alpha\in A} L_{\alpha}
\NC i’’\NA =j’’+k’’ \NC A \NA = D \cup E \NR
\stopalign
\stopformula
where I have introduce a symbol \NA for alignment.
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Re: [NTG-context] Math alignment
On 7 Jul 2015, at 21:18, Wolfgang Schuster schuster.wolfg...@gmail.com
wrote:
I have also put in an extra alignment to see what happens, monospace code
alignment style. Changing ‘left’ to ‘right did not seem to have any effect
here.
Can you see the effect of the alignment?
\starttext
\startformula
\startmatrix[align={left,middle,right}]
\NC a \NC b \NC c \NR
\NC aa \NC bb \NC cc \NR
\NC aaa \NC bbb \NC ccc \NR
\stopmatrix
\stopformula
\stoptext
Thanks. I know that example. I just noticed it seemed to have no effect in the
other example, for some reason.
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Re: [NTG-context] Math alignment
On 7 Jul 2015, at 21:49, Wolfgang Schuster schuster.wolfg...@gmail.com wrote: You should google for mathalign.pdf which explains and shows examples for the matrix, cases etc. environments. It looks rather basic, except for last formula of section 9. The document amshelp.pdf, ch. 7, has some nice pure math style examples. ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Environments
On 7 Jul 2015, at 11:05, luigi scarso luigi.sca...@gmail.com wrote:
For LaTeX style environments do you mean
e.g.
https://it.sharelatex.com/learn/Environments
? (just to be sure )
Yes, the \begin{foo} … \end{foo} syntax. Technically, an environment means that
variables are stacked in a syntactically local group, as in \begingroup …
\endgroup.
The syntax in the example file is «foo· … ·» or «foo· … ·foo», so one does not
have to write the ‘start' and ‘stop’ all the time, and does not have to write
the name of the environment again at the end.
In this case context has the \definesomething commands as for example
http://wiki.contextgarden.net/Command/definetyping
I think this corresponds (in pseudocode) to my
\new{Environment}{typing}%
{}{before code}%
{after code}{}
In LaTeX, if I remember correctly, it would expand to \begingroupbefore code
… after code\endgroup.
I added so one can have
\new{Environment}{typing}%
{before code}{begin code}%
{end code}{after code}
expanding to
before code\begingroupbegin code … end code\endgroupafter code
So one has more control over designing the environment. One can then also
define a new environment
\new{Environment}{typingmore}%
{code}{code«typing·args}%
{·typing»code}{code}
I think, to make specializations.
Context has also
http://wiki.contextgarden.net/Command/startenvironment
but I suppose it's not what you mean.
It looks like just adding a series of command names, rather than a stacked
environment, or a namespace (module). If one wants to avoid name clashes, one
can have names like in directory names, living without any local group.
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[NTG-context] Smallmatrix not implemented
Smallmatrix from AMS-TeX is not implemented in ConTeXt (Tex Live 2015), though crossed out in m-newmat.tex. I found this old post: http://www.ntg.nl/pipermail/ntg-context/2005/013146.html ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
[NTG-context] Math alignment
The example below shows the intended output when using original TeX code
(compiled with ‘context' of TeX Live 2015): a pair of left braced formulas.
The first comment shows what works in AMS-LaTeX.
However, when trying similar ConTeXt commands, I get the error shown in the
comment below. What ConTeXt command might use here?
---
\setupformulas[location=left]
\starttext
\def\equlb#1{\left\{\eqalign{#1}\right.} %equation left braced
% AMS-LaTeX
%\def\equlb#1{\left\{ \begin{aligned} #1 \end{aligned}\right.} % equation left
braced
% ConTeXt error: You can't use `\halign' in math mode.
%\def\equlb#1{\left\{ \startalign #1 \stopalign\right.}
%\def\equlb#1{\left\{ \startmathalignment #1 \stopmathalignment\right.}
\startformula \placeformula[JcoordDef]
J^j:\equlb{ω^0 → 0 \cr ω^j → 0} \quad
\equlb{ω^k → ω^l \cr ω^l → -ω^k} \stopformula
\stoptext
---
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[NTG-context] Integral spacing
I get too much spacing after the integrals when using ‘context’ (TeX Live 2015) - see first example below. Cf. the second example below, compiled with luatex. In ConTeXt, the result is the same regardless of body font, and also if using original TeX \int. --- context --- \setupbodyfont[xits,10pt] %\setupbodyfont[stix,10pt] \starttext \startformula ⟨φ|ψ⟩ ≔ ∫… ∫ dx_1 … dx_n\, φ(x_1, …, x_n)^* ψ(x_1, …, x_n) \stopformula \startformula ⟨φ|ψ⟩ ≔ \int … \int dx_1 … dx_n\, φ(x_1, …, x_n)^* ψ(x_1, …, x_n) \stopformula \stoptext --- --- luatex --- $$ \left\phi|\psi\right = \int \ldots \int dx_1 \ldots dx_n\, \phi(x_1, \ldots, x_n)^* \psi(x_1, \ldots, x_n) $$ \end --- ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Math alignment
[I do not get copies from the list, though having signed up.] Wolfgang Schuster wrote: On 6 Jul 2015, at 11:24, Hans Aberg haber...@telia.com wrote: The example below shows the intended output when using original TeX code (compiled with ‘context' of TeX Live 2015): a pair of left braced formulas. The first comment shows what works in AMS-LaTeX. However, when trying similar ConTeXt commands, I get the error shown in the comment below. What ConTeXt command might use here? Take a look at the wiki page [1] for multiline equations and also the linked PDF at the start of the page. [1] http://wiki.contextgarden.net/Multiline_equations#Cases The spacing is different in cases - TeX also has such a variation. Specifically, there is extra space before the conditionals. In addition, it seems \startmathcases ... \stopmathcases is not working with UTF-8: in the example below, the ω’s on the second line, after the arrows, disappear in my PDF. \startformula J^j:\startmathcases\NC ω^0 \NC→ 0 \NR \NC ω^j \NC→ 0 \stopmathcases \quad \startmathcases \NC ω^k \NC→ ω^l \NR \NC ω^l \NC→ -ω^k \stopmathcases \stopformula ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Smallmatrix not implemented
[I do not get copies from the list, though having signed up.]
Smallmatrix from AMS-TeX is not implemented in ConTeXt (Tex Live 2015),
though crossed out in m-newmat.tex.
You can create your own matrix environment for inline use:
\definemathmatrix
[smallmatrix]
[left=\Big(,
right=\Big),
style=\scriptstyle,
strut=0.7,
distance=.25em]
\starttext
This is a example \m{ \startsmallmatrix \NC a \NC b \NR \NC c \NC d \NR
\stopsmallmatrix } for a smallmatrix environment.
It looks pretty much like the AMS-LaTeX variation. Below is another example of
use, as a displayed formula.
% Defines a small two-by-two matrix.
\def\twomatrix#1#2#3#4{\startsmallmatrix\NC{#1}\NC{#2}\NR\NC{#3}\NC{#4}\NR\stopsmallmatrix}
% The Pauli spin matrices, explicit forms.
\def\pspint{{\twomatrix1001}}
\def\pspinx{{\twomatrix0110}}
\def\pspiny{{\twomatrix0{-핚}핚0}}
\def\pspinz{{\twomatrix100{-1}}}
Pauli spin matrices
\startformula
σ^0 ≔ \pspint, \quad σ^3 ≔ \pspinz, \quad
σ^1 ≔ \pspinx, \quad σ^2 ≔ \pspiny
\stopformula
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[NTG-context] Font selection ranges
I want to define an environment for computer code including non-ASCII
characters, using Xits or STIXGeneral except in the ASCII range, where some
monospace font like Courier should be used.
If I do:
\setupbodyfont[xits,10pt]
\definetyping[code]
\setuptyping[code][margin=yes]
\starttext
\startcode
for ∀i, j ∈ I
do a(i, j) ≔ b(i, j)
\stopcode
\stoptext
Then the math characters won't show. They will show using
\setuptyping[code][style=normal,margin=yes]
but then the ASCII range isn't monospace.
In LaTeX, one can use \setmathfont[range={0001-...,}] to set ranges for fonts,
but I could not find that for ConTeXt.
Hans
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