[Groff] : ASCII Minus Sign in man Pages

[Doug McIlroy]

>  If you want a real minus sign (in particular in mathematical
> formular as opposed to in programming language source code),
> \- is not a good choise.

This statement baffles me. That is exactly what \- is supposed
to mean: the mathematical minus sign. In particular it is supposed
to match + in width and weight. Are you saying that it no longer
has that property and something else does?

Doug