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
_______________________________________________
Axiom-developer mailing list
[email protected]
https://lists.nongnu.org/mailman/listinfo/axiom-developer
