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feat(ring_theory/noetherian): Nakayama's Lemma #778

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merged 3 commits into from
Mar 8, 2019
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kckennylau
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TO CONTRIBUTORS:

Make sure you have:

  • reviewed and applied the coding style: coding, naming
  • for tactics:
  • make sure definitions and lemmas are put in the right files
  • make sure definitions and lemmas are not redundant

If this PR is related to a discussion on Zulip, please include a link in the discussion.

For reviewers: code review check list

/-- Nakayama's Lemma. Atiyah-Macdonald 2.5, Eisenbud 4.7, Matsumura 2.2, Stacks 10.19.1 (00DV) -/
theorem exists_sub_one_mem_and_smul_eq_zero_of_fg_of_le_smul {R : Type*} [comm_ring R]
{M : Type*} [add_comm_group M] [module R M]
(I : ideal R) (N : submodule R M) (hn : N.fg) (hin : N ≤ I • N) :
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Can you also give the corollary for finitely generated modules. (I.e., the version that does not mention submodules.) I guess that is a statement that will be applied quite often.

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How would you state it?

jcommelin and others added 2 commits March 1, 2019 09:05
Co-Authored-By: kckennylau <kc_kennylau@yahoo.com.hk>
@ChrisHughes24 ChrisHughes24 merged commit 7de57e8 into master Mar 8, 2019
@ChrisHughes24 ChrisHughes24 deleted the nakayama branch March 8, 2019 20:10
anrddh pushed a commit to anrddh/mathlib that referenced this pull request May 15, 2020
)

* feat(ring_theory/noetherian): Nakayama's Lemma

* Update src/ring_theory/noetherian.lean

Co-Authored-By: kckennylau <kc_kennylau@yahoo.com.hk>
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3 participants