# Caveat: correct spacing in quotient

When taking a quotient with respect to a given equivalence relation, make sure to get the correct spacing. That is, `S/\sim`

is not correct because `\sim`

is acting like an operator here. It results in
$$S/\sim$$
while the correct result would be
$$S/{\sim}$$

This is easily achieved by enclosing the operator in braces, *i.e.*, just write `S/{\sim}`

and all is well. This stuff can be found in the TeXbook of course, but you have to put it in practice.

It is remarkable how nit-picky one can get after using TeX for a while.