In theorem proofs, I would like to use numbered parts. For example,

Theorem 1. Blabla.


Part 1. blabla

Part 1.1. Blabla

Part 2

Part 2.1

Part 2.2

This is different from this question since it has only one level in that question.

  • this is not good idea. you're going to mess up the structure of your document. just my opinion ... – Zarko Jun 6 '18 at 21:43
  • @Zarko I do not mean the same section as in \section. I mean just splitting the proof into multiple parts. – xuhdev Jun 6 '18 at 21:46
  • try to use some nested lists, for example accordingly modified description . for more specific advice please provide what you tray so far, the best in form of small but complete document begining with \documentclass{...}, followed by preamble (only with packages which are relevant to page layout and your problem) and ending with \end{document}. – Zarko Jun 6 '18 at 21:53
  • Too many nested levels in a proof is IMHO a really poor writing. If your theorem do need many steps to be proved and each step takes many space, you can use a structure called “Lemma”. They are literally “building blocks” of the main theorem and will make your article more well-structured. – Ruixi Zhang Jun 6 '18 at 21:55
  • 1
    Why not introducing a couple of lemmas? – user94293 Jun 6 '18 at 22:05

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