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Project-declaredLean 4.31.0 · mathlib@fabf563a

Mem associated Primes ker mk Linear Map of mem associated Primes of inter nonempty

HarderNarasimhan.CommutativeAlgebra.mem_associatedPrimes_ker_mkLinearMap_of_mem_associatedPrimes_of_inter_nonempty

Plain-language statement

If p is an associated prime of M and p meets the multiplicative set S, then p is an associated prime of the kernel of the localization map mkLinearMap S M : M →ₗ[R] LocalizedModule S M. This is the “meets S” direction used to identify associated primes of ker (mkLinearMap S M) with the associated primes of M that are not disjoint from...

Exact Lean statement

lemma mem_associatedPrimes_ker_mkLinearMap_of_mem_associatedPrimes_of_inter_nonempty
{R : Type*} [CommRing R] [IsNoetherianRing R]
{M : Type*} [AddCommGroup M] [Module R M]
(S : Submonoid R) {p : Ideal R}
(hp : p ∈ associatedPrimes R M) (hinter : (p.carrier ∩ S).Nonempty) :
  p ∈ associatedPrimes R (LinearMap.ker (LocalizedModule.mkLinearMap S M))

Formal artifact

Lean source

Canonical source
Full Lean sourceLean 4
lemma mem_associatedPrimes_ker_mkLinearMap_of_mem_associatedPrimes_of_inter_nonempty{R : Type*} [CommRing R] [IsNoetherianRing R]{M : Type*} [AddCommGroup M] [Module R M](S : Submonoid R) {p : Ideal R}(hp : p  associatedPrimes R M) (hinter : (p.carrier ∩ S).Nonempty) :  p  associatedPrimes R (LinearMap.ker (LocalizedModule.mkLinearMap S M)) := by  rcases ((isAssociatedPrime_iff (R := R) (M := M)).mp hp) with hpPrime, y, hy  rcases hinter with r, hrp, hrS  have hry : r • y = 0 := by    rw [hy] at hrp    simpa [Submodule.mem_colon_singleton] using hrp  have hyker : y  LinearMap.ker (LocalizedModule.mkLinearMap S M) := by    rw [LinearMap.mem_ker]    exact (LocalizedModule.mem_ker_mkLinearMap_iff (S := S) (m := y)).2 r, hrS, hry  refine ((isAssociatedPrime_iff (R := R) (M := LinearMap.ker (LocalizedModule.mkLinearMap S M))).2    hpPrime, y, hyker, ?_)  ext z  constructor  · intro hz    rw [hy] at hz    simpa [Submodule.mem_colon_singleton] using hz  · intro hz    rw [hy]    simpa [Submodule.mem_colon_singleton] using hz
Project
Harder-Narasimhan
License
Apache-2.0
Commit
20220e90b72c
Source
HarderNarasimhan/CoprimaryFiltration/CommutativeAlgebra.lean:68-91

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Project-declaredLean 4.31.0

Associated Primes ker mk Linear Map eq

HarderNarasimhan.CommutativeAlgebra.associatedPrimes_ker_mkLinearMap_eq

Project documentation

Associated primes of the kernel of the localization map. This identifies the associated primes of ker (LocalizedModule.mkLinearMap S M) : Submodule R M with the associated primes of M that do meet the multiplicative set S. Equivalently, these are the associated primes of M after removing those disjoint from S. This lemma is used as the “kernel...

algebraic geometryvector bundlescategory theory

Source project: Harder-Narasimhan

Person-level attribution pending.

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Project-declaredLean 4.31.0

Associated Primes ker mk Linear Map subset

HarderNarasimhan.CommutativeAlgebra.associatedPrimes_ker_mkLinearMap_subset

Plain-language statement

One-sided inclusion for associated primes of the kernel of the localization map. If p ∈ associatedPrimes R (ker (mkLinearMap S M)), then p is an associated prime of M and p is not disjoint from the multiplicative set S. This is one direction of associatedPrimes_ker_mkLinearMap_eq.

algebraic geometryvector bundlescategory theory

Source project: Harder-Narasimhan

Person-level attribution pending.

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Project-declaredLean 4.31.0

Associated Primes localized Module subset disjoint

HarderNarasimhan.CommutativeAlgebra.associatedPrimes_localizedModule_subset_disjoint

Plain-language statement

Associated primes of a localized module are disjoint from the multiplicative set. More precisely, if p ∈ associatedPrimes R (LocalizedModule S M), then p.carrier ∩ S = ∅. This is a standard fact in commutative algebra: an element of S becomes a unit after localization, so no associated prime of the localized module can contain an element of S.

algebraic geometryvector bundlescategory theory

Source project: Harder-Narasimhan

Person-level attribution pending.

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