Actually it sort of looks just plain wrong.

Lamport LaTex says \: provides medium spacing rather
than whatever the default would be;

Spivak Joy p.220 talks about spacing similarly but
he seems flub it in line (12) of his example versus
his discussion below it -- missing a colon in the TeX.

So the notion of "something over something else" seems
to have gotten lost.  And in the interpreter's output
\: looks appropriately used, for spacing.

Gene

On 7/7/2014 4:59 PM, Ralf Hemmecke wrote:
On 07/07/2014 10:50 PM, [email protected] wrote:
Ralf,

This was probably a latex macro for
\[ a \mathrel{\mathop{\rightleftarrows}^{\mathrm{over}}_{\mathrm{under}}} b\]

which uses the amssymb package to create


             over
       a  ---------> b
          <--------
            under

Tim

What confuses me is what is currently produced.
The TeX output is pretty useless. The algebra output rather confuses me.
without the | it would perhaps be like what Tim says.

Anyhow, it looks like there is need for a better specification.
I'm not going to support this in my new TexFormat.

Ralf

(1) -> O==>OutputForm
(3) -> )set output tex on
(3) -> overlabel(a::O, b::O)$O

         a
         |
    (3)  b
$$
OVERLABEL
\left(
{a, \: b}
\right)
\leqno(3)
$$


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