Homology of preadditive categories #
In this file, it is shown that if C is a preadditive category, then
ShortComplex C is a preadditive category.
Given a left homology map data for morphism φ, this is the induced left homology
map data for -φ.
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Given left homology map data for morphisms φ and φ', this is
the induced left homology map data for φ + φ'.
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Given a right homology map data for morphism φ, this is the induced right homology
map data for -φ.
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Given right homology map data for morphisms φ and φ', this is the induced
right homology map data for φ + φ'.
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Given a homology map data for a morphism φ, this is the induced homology
map data for -φ.
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Given homology map data for morphisms φ and φ', this is the induced homology
map data for φ + φ'.
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A homotopy between two morphisms of short complexes S₁ ⟶ S₂ consists of various
maps and conditions which will be sufficient to show that they induce the same morphism
in homology.
a morphism
S₁.X₁ ⟶ S₂.X₁- h₀_f : CategoryStruct.comp self.h₀ S₂.f = 0
a morphism
S₁.X₂ ⟶ S₂.X₁a morphism
S₁.X₃ ⟶ S₂.X₂a morphism
S₁.X₃ ⟶ S₂.X₃- g_h₃ : CategoryStruct.comp S₁.g self.h₃ = 0
- comm₂ : φ₁.τ₂ = CategoryStruct.comp S₁.g self.h₂ + CategoryStruct.comp self.h₁ S₂.f + φ₂.τ₂
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Constructor for null homotopic morphisms, see also Homotopy.ofNullHomotopic
and Homotopy.eq_add_nullHomotopic.
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The obvious homotopy between two equal morphisms of short complexes.
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The obvious homotopy between a morphism of short complexes and itself.
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The symmetry of homotopy between morphisms of short complexes.
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If two maps of short complexes are homotopic, their opposites also are.
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The transitivity of homotopy between morphisms of short complexes.
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Homotopy between morphisms of short complexes is compatible with addition.
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Homotopy between morphisms of short complexes is compatible with subtraction.
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Homotopy between morphisms of short complexes is compatible with precomposition.
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Homotopy between morphisms of short complexes is compatible with postcomposition.
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Homotopy between morphisms of short complexes is compatible with composition.
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The homotopy between morphisms in ShortComplex Cᵒᵖ that is induced by a homotopy
between morphisms in ShortComplex C.
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The homotopy between morphisms in ShortComplex C that is induced by a homotopy
between morphisms in ShortComplex Cᵒᵖ.
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Equivalence expressing that two morphisms are homotopic iff their difference is homotopic to zero.
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A morphism constructed with nullHomotopic is homotopic to zero.
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The left homology map data expressing that null homotopic maps induce the zero morphism in left homology.
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The right homology map data expressing that null homotopic maps induce the zero morphism in right homology.
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A homotopy equivalence between two short complexes S₁ and S₂ consists
of morphisms hom : S₁ ⟶ S₂ and inv : S₂ ⟶ S₁ such that both compositions
hom ≫ inv and inv ≫ hom are homotopic to the identity.
the forward direction of a homotopy equivalence.
the backwards direction of a homotopy equivalence.
- homotopyHomInvId : Homotopy (CategoryStruct.comp self.hom self.inv) (CategoryStruct.id S₁)
the composition of the two directions of a homotopy equivalence is homotopic to the identity of the source
- homotopyInvHomId : Homotopy (CategoryStruct.comp self.inv self.hom) (CategoryStruct.id S₂)
the composition of the two directions of a homotopy equivalence is homotopic to the identity of the target
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The homotopy equivalence from a short complex to itself that is induced by the identity.
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The inverse of a homotopy equivalence.
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The composition of homotopy equivalences.