Commit 2025-03-17 01:20 5449dc90

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feat: add some elementary number theory lemmas (#22989) This PR adds a few elementary lemmas of a number theoretic flavor. It also improves the sectioning in Mathlib/RingTheory/Fintype.lean. See here on Zulip. I'm labeling this t-number-theory although the modified files are under Data and RingTheory.

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