add \choose

[gwern]

add \choose

[jgm]

Workaround: use \binom{a}{b} instead of a \choose b.

+++ gwern [Oct 01 13 17:33 ]:

It was recently pointed out to me that my combinatorial LaTeX in
[1]http://www.gwern.net/sicp/Chapter%201.1#section-2 was apparently
broken and readers were seeing raw LaTeX. The first formula goes
{3 \choose 2} = \frac{3!}{2! \times (3-2)!} = \frac{3!}{2! \times 1!} = \frac{3!
}{2 \times 1} = \frac{3!}{2} = \frac{6}{2} = 3

I had checked in Texify that this worked but after some playing around
in Pandoc, it seems that the problem is the \choose operator. I don't
see any use of \choose in cgi/texmath.html, and an attempt to use it in
texmath.hs fails:
$ runhaskell texmath.hs
3 \choose 2
"formula" (line 1, column 11):
unexpected "2"

It would be nice if this could be supported.

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References

1. http://www.gwern.net/sicp/Chapter%201.1#section-2
2. #21