punctuation on mathematical formulas
A standard principle for the punctuation of mathematical formulae is that they should be punctuated exactly the same as text is. Even when the formula is displayed in a separate line, it should follow standard punctuation: it should end with a dot, it should not necessarily be preceded by a colon, it should not be outside of the sentence.
Bad punctuation Let be defined by the following formula: A duoidal category has a distributor
Better punctuation Let be defined by A duoidal category has a distributor,
As a general principle, the reader should be able to read the sentence out loud on their head, reading each mathematical symbol out loud and reaching a well-punctuated sentence.
References.
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