13. Many readers will skim over formulas on their first reading of your exposition. Therefore, your sentences should flow smoothly when all but the simplest formulas are replaced by “blah” or some other grunting noise.

20. Some handy maxims:
Watch out for prepositions that sentences end with.
When dangling, consider your participles.
About them sentence fragments.
Make each pronoun agree with their antecedent.
Don’t use commas, which aren’t necessary.
Try to never split infinitives.

I know the first is certainly true for me as I’ve been trying to wade through Haskell (a language into “literate programming”) introductions recently, which are very math-heavy.