punctuation after a fraction in math mode

I use to punctuate my equations.

In math mode, when the last "word" is a fraction, I raise the final point using \cdot like in

x = \frac{3}{2} \cdot


so that the "." is at the same height as the fraction bar. So my questions are:

• Is it good practice?
• Is there an equivalent of \cdot for the comma?
-
Is it good practice? No, in my opinion. –  egreg Jan 29 '13 at 12:50
Thanks @egreg ! –  Marco Jan 29 '13 at 13:17

I agree with @egreg, the punctuation is part of the sentence structure and so should use the text fonts, if you can't avoid needing sentence punctuation in the display use something like \quad\text{.} (or \quad\text{,}).

-
Are the \quads really necessary? I usually put them with no space or, if it looks bad, with some \; or \: sometimes. –  Manuel Jan 29 '13 at 12:56
@Manuel No any space that looks good in the circumstances (I don't think any position really looks good but sometimes it can't be avoided) a quad (1em) might be too much I agree. –  David Carlisle Jan 29 '13 at 13:00
I will avoid them as much as possible as you and @egreg suggest, Thanks :-) –  Marco Jan 29 '13 at 14:11