"Michael Adams" <mbad...@paradise.net.nz> escreveu na mensagem
news:201006261458.52058.mbad...@paradise.net.nz...
On Saturday 26 June 2010 00:10, InBetweener wrote:
(...)
I cannot see any slashed examples of "R" on your given page.
Indeed. Maybe because of some html limitation? by the way, my link is too long and line-broken. For convenience, the same thing,
sorther: http://en.wikipedia.org/wiki/Relation_(mathematics)#Formal_definition.
We are
floundering a bit here and either need a graphical example or a better
description.
I will try to send it attached (though I suspect it will not work). I've just tried to send two posts with .gif file attached but so
far they have not appeared in the newsgroup. Maybe they have been rejected?
I can find no examples of any R being crossed in any way on the
Internet after searching "binary relational mathematics" and reading till my
brain hurt.
Forgive me for such pain. :-) I didn't know that it would be that difficult to find it on the internet. Textbooks use this, like
mine: "Teoria Elementar dos Conjuntos", by Edgard de Alencar Filho, 19th Edition, 1980, Livraria Nobel S.A. The title translation is
something like "Elemental Set Theory", or even "Naive Set theory". I'm almost sure I've seen this same notation inside other works,
but I have none with me at this moment. For now, I've just found someone else who wants the same I want, but in LaTeX:
http://en.wikipedia.org/wiki/Talk:Binary_relation#Relation_negations_in_LaTeX.
One _singular_ visual example would suffice. At a guess i would
say you are looking for something like a diagonal slash across a capital R by
your decription but this has not been made clear.
This is "exactly* what I want. But it could be a diagonal slash across anything
I may need. And some times I really need.
AFAIK, options in OO.o are:
"acute{R} bar{R} breve{R} check{R} circle{R} dddot{R} ddot{R} dot{R} grave{R}
hat{R} overline{R} overstrike{R} tilde{R} vec{R} widehat{R} widetilde{R}
widevec{R} setr" all of which work on my version. You are welcome to copy and
paste and see if any of these work for your purpose.
Thanks for the list. Microsoft Equation Editor is somewhat longer in the category "attributes". I have even tried to convert an MS
equation into an OO.o document. I got a bit distorted figure, but everything in place. When I try to edit the converted equation,
several "attributes" are lost even before I change anything. :-(
I've just installed MathType and its list is even longer. It has even two options to "negate" any symbol. But one of them seems to
have no translation to any other math "language".
If this is not acceptable then realise that the equation editor in Microsoft
Office is a cut-down version of the stand-alone specialist tool MathType by
DesignScience and that MathType allows you to cut and paste to OO.o or Office
among others. Neither Ofice nor OO.o as "general office productivity
suites"TM are designed to suit every niche market.
I will try to use standalone MathType and see the results. But I really would prefer to stick at OO.o alone. But I think that the
feature I'm looking for simply doesn't exist. Maybe it could be put into a whish list...
.
.
.
Ok, I've spent some time trying MathType. It allows me to copy its equations to other applications, so, if it is not possible to
send a visual example, maybe someone can paste the examples below into the respective applications in order to see what I'm talkning
about.
- Plain TeX:
$$\eqalign{
& x\not Ry \cr
& x\not Fy \cr
& x\,\not \equiv y \cr
& \not \exists x:x \ne x \cr} $$
- LaTeX 2.09 and later:
\[\begin{array}{l}
x\not Ry \\
x\not Fy \\
x\,\not \equiv y \\
\not \exists x:x \ne x \\
\end{array}\]
- Math and Physics Web Forum:
[math]\begin{array}{l}
x\not Ry \\
x\not Fy \\
x\,\not \equiv y \\
\not \exists x:x \ne x \\
\end{array}[/math]
- Wikipedia (I've tested: bad rendering, except for & \not{\exists }x:x\ne x \\
):
<math>\begin{align}
& x\not{R}y \\
& x\not{F}y \\
& x\,\not{\equiv }y \\
& \not{\exists }x:x\ne x \\
\end{align}</math>
Ok, I think it's enough. My next post will try *again* to send an image. If it the newsgroup doesn't allow that (the mos likely), is
there a way of sending the .gif to all of you who want to *see* what I'm looking for?
HTH
--
Michael
Thanks a lot, Michael.
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