[skela224]

There's the idea that pure math papers should not have a "Conclusion" section, where the author summarizes what has been done and says a few informal words. This doesn't seem to help the exposition but is nonetheless prevalent: if you haven't paid attention to the proofs and derivation, they aren't going to retell what happened in plain plain language.

e.g. look at this advice from the academia stackexchange, to a young aspiring mathematician:

"If you're relatively young and inexperienced and hoping for best results on the rapid publication of your work in strong journals, I would stick pretty mercilessly to the format: (i) strong introduction motivating your work and explaining clearly the value added both in the results themselves and the techniques of proof and (ii) the rest of the paper contains careful proofs of all the results, in a very clear, linear, easy to follow fashion, e.g. "Section A.B: Proof of Lemma C".