punctuation after a fraction in math mode

Question

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?

Answer 1

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{,}).