[Tex/LaTex] For formal articles, should a displayed equation be followed by a punctuation to conform to the language grammar

equationsgrammar

For formal articles, should a displayed equation be followed by a punctuation to conform to the language grammar ?

For example:

The most well-known physics formula is

    \[E=mc^2.\] %should I put a period here?

And if you expand

    \[(x+y)^2,\] % should I put a comma here? 

you will ...

Best Answer

For what it's worth, Knuth says that they should be added in Mathematical Writing.

Don’t overdo the use of colons. While the colon in ‘Define it as follows:’ is fine, the one in ‘We have: ⟨formula⟩’ should be omitted since the formula just completes the sentence. Some papers had more colons than periods.

That said, in the TeXbook, he omits the periods in some of his displays, but usually when he's showing TeX input and output. Compare the display on page 127

                                                                   α, β, γ, δ;

to the displays on page 128 (which I won't duplicate since that previous one was enough of a pain).

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