OAI/Algebra/Finitistic/Dimension/PDAllSimples.lean

GitHub source file

2 declarations, 0 contain sorry, 0 declared as axioms

  1. theorem OAI.LittleFinitistic.PDTensor.exists_simple_tensor_nonzero line 15

    Source 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

  2. theorem OAI.LittleFinitistic.PDTensor.pdLE_iff_simpleTor_zero line 56

    Source 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