Hi Peter and François,
Sent from my iPad
On 29/12/2010, at 7:03 AM, Peter Dyballa <peter_dyba...@web.de> wrote:
>
> Am 28.12.2010 um 19:44 schrieb François Patte:
>
>> Multiply 5 by 7: $7\times 5 = 35$
>
> With XeTeX and fontspec loaded you also load xunicode. So you can write as
> well:
>
> Multiply 5 by 7: 7 \texttimes{} 5 = 35
This will paint the correct symbols on the page, but does not guarantee that
correct spacing is used, according to the conventions of mathematical
typesetting. You may get this with some fonts, but there is no guarantee.
But more importantly, it does not encode anything about the meaning of these
symbols, being used as a mathematical expression. Thus it does not help you if
you later wish to adapt this to more complicated pieces of mathematics, nor
does it allow for more sophisticated processors to embed tagging of this
meaning within your document, for later extraction and proper interpretation in
the context of an interactive electronic documents.
At some time in the future you will come to appreciate the value of having
included this extra markup within your document source, by going the whole hog
of writing:
> Multiply $5$ by $7$: $5 \times 7 = 35$
or even using LaTeX delimiters, as:
Multiply \(5\) by \(7\): \(5\times 7 = 35\)
>
> Multiply 5 by 7: 7 × 5 = 35
>
> I see another problem here: Is 5 multiplied by 7 always equal to 7 × 5?
Good point. Although multiplication of integers is usually commutative, it is
worthwhile to preserve the natural order, as an hint that in higher
mathematical contexts this need not be the case.
But putting that reason aside, you will also find it easier to make multiple
similar examples using different numbers by Copy/Paste/Edit , when the numbers
occur in a consistent order within your expressions.
>
> --
> Greetings
>
> Pete
Hope this helps,
Ross
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