What is the proper way of punctuating block formulae? There seem to be variance from “a mathematical text is, before everything else, a text” (qtd. via MathOverflow), to confusion whether parenthetically numbered equations follow the same rules, to publications like my current American physics textbook which uses none.
Personally, I used to punctuate my formulae, just like I separate statements in my algebra and my programming with semi-colons.
Another thing is that in practical application within LaTeX environment, some insist that punctuation, as part of the text, should be styled like the rest of the text, and be outside, whereas formulae have their own styling. But on Physics.SE MathJAX pushes outside punctuation into the next paragraph (it parses formula as a separate
<div> breaking up the flow of text regardless of carriage returns?).