[texhax] Some questions on math mode
Benjamin Sambale
bsambale at gmx.de
Sun Mar 1 17:14:53 CET 2009
mathcal is often used to define sets consisting of sets. A typical
example is the set of equivalence classes of a equivalence relation.
Philip TAYLOR schrieb:
> P. R. Stanley wrote:
>
>> Hi folks
>> 1. What effect does placing a letter [A-Za-z] in math mode produce,
>> for example $x$ $A$?
>>
>
> It sets the letter in maths italic, which is similar
> to (but not the same as) text italics.
>
>
>> 2. The \mathcal macro displays the enclosed character in caligraph
>> fond. According to the document at
>> http://www.math.uiuc.edu/~hildebr/tex/course/intro2.html
>>
>> It says that it's used "often to denote sets". What sort of sets?
>> Some more information on the effects of the mathcal macro on the
>> enclosed character plus it's uses would be appreciated.
>>
>
> I'm no mathematician (as Chris Rowley will hasten to assure
> you !) but a short fragment from an LMS paper may help :
>
>
>> For any non-empty subset $\mathcal I$ of the natural numbers
>>
>
>
>> 3. The same document states that the \mathbb macro can be used for
>> displaying rationals reals and so forth. Again, What visual effects
>> does the mathbb have on the enclosing character.
>>
>
> It creates "blackboard bold", which looks as if the same
> character had been rendered twice with a small displacement
> (horizontal) between the two instances.
>
>
>> I have come across
>> quite a few of those \math macros -- mathrm, mathtt and so on. It's
>> hard to know what they do or, more importantly, when they should be
>> used. Any tips would be most appreciated.
>>
>
> In general, the "math" prefix simply indicates that the
> macro is intended for use in maths mode; the characters
> that follow indicate the intended effect, such as
> "rm" => "roman", meaning upright; "tt" -> "teletype",
> meaning monospaced and highly stylised. It's a great
> shame that (as far as I know) no-one has yet reported
> a document from whence all of these things can be
> gleaned.
>
> Philip TAYLOR
> _______________________________________________
> TeX FAQ: http://www.tex.ac.uk/faq
> Mailing list archives: http://tug.org/pipermail/texhax/
> More links: http://tug.org/begin.html
>
> Automated subscription management: http://tug.org/mailman/listinfo/texhax
> Human mailing list managers: postmaster at tug.org
>
>
More information about the texhax
mailing list