OAI/Algebra/Finitistic/Dimension/PDAllSimples.lean
2 declarations, 0 contain sorry, 0 declared as axioms
- theorem
OAI.LittleFinitistic.PDTensor.exists_simple_tensor_nonzeroline 15Source documentation
A nonzero finite module is detected by tensor with an actual simple right submodule of A/rad A. This is an existence proof, not an assumed simple detector.
theorem exists_simple_tensor_nonzero (N : Type u) [AddCommGroup N] [Module k N] [Module A N] [IsScalarTower k A N] [Module.Finite A N] [Nontrivial N] : ∃ S : Submodule Aᵐᵒᵖ (Residue (A := A)), IsSimpleModule Aᵐᵒᵖ S ∧ …Mentions: OAI.LittleFinitistic.PDTensor.Residue
- theorem
OAI.LittleFinitistic.PDTensor.pdLE_iff_simpleTor_zeroline 56Source documentation
The exact simple-module form of projective-dimension detection. The test modules here are actual simple right submodules of the fixed radical quotient.
theorem pdLE_iff_simpleTor_zero (n : ℕ) : HasProjectiveDimensionLE M.cat n ↔ ∀ S : Submodule Aᵐᵒᵖ (Residue (A := A)), IsSimpleModule Aᵐᵒᵖ S → …Mentions: OAI.LittleFinitistic.PDTensor.Residue