253 lines
12 KiB
Text
253 lines
12 KiB
Text
/-
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Copyright (c) 2015 Floris van Doorn. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Floris van Doorn
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Cubes
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-/
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import .square
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open equiv equiv.ops is_equiv sigma sigma.ops
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namespace eq
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inductive cube {A : Type} {a₀₀₀ : A} : Π{a₂₀₀ a₀₂₀ a₂₂₀ a₀₀₂ a₂₀₂ a₀₂₂ a₂₂₂ : A}
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{p₁₀₀ : a₀₀₀ = a₂₀₀} {p₀₁₀ : a₀₀₀ = a₀₂₀} {p₀₀₁ : a₀₀₀ = a₀₀₂}
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{p₁₂₀ : a₀₂₀ = a₂₂₀} {p₂₁₀ : a₂₀₀ = a₂₂₀} {p₂₀₁ : a₂₀₀ = a₂₀₂}
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{p₁₀₂ : a₀₀₂ = a₂₀₂} {p₀₁₂ : a₀₀₂ = a₀₂₂} {p₀₂₁ : a₀₂₀ = a₀₂₂}
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{p₁₂₂ : a₀₂₂ = a₂₂₂} {p₂₁₂ : a₂₀₂ = a₂₂₂} {p₂₂₁ : a₂₂₀ = a₂₂₂}
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(s₁₁₀ : square p₀₁₀ p₂₁₀ p₁₀₀ p₁₂₀)
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(s₁₁₂ : square p₀₁₂ p₂₁₂ p₁₀₂ p₁₂₂)
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(s₀₁₁ : square p₀₁₀ p₀₁₂ p₀₀₁ p₀₂₁)
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(s₂₁₁ : square p₂₁₀ p₂₁₂ p₂₀₁ p₂₂₁)
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(s₁₀₁ : square p₁₀₀ p₁₀₂ p₀₀₁ p₂₀₁)
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(s₁₂₁ : square p₁₂₀ p₁₂₂ p₀₂₁ p₂₂₁), Type :=
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idc : cube ids ids ids ids ids ids
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variables {A B : Type} {a₀₀₀ a₂₀₀ a₀₂₀ a₂₂₀ a₀₀₂ a₂₀₂ a₀₂₂ a₂₂₂ a a' : A}
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{p₁₀₀ : a₀₀₀ = a₂₀₀} {p₀₁₀ : a₀₀₀ = a₀₂₀} {p₀₀₁ : a₀₀₀ = a₀₀₂}
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{p₁₂₀ : a₀₂₀ = a₂₂₀} {p₂₁₀ : a₂₀₀ = a₂₂₀} {p₂₀₁ : a₂₀₀ = a₂₀₂}
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{p₁₀₂ : a₀₀₂ = a₂₀₂} {p₀₁₂ : a₀₀₂ = a₀₂₂} {p₀₂₁ : a₀₂₀ = a₀₂₂}
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{p₁₂₂ : a₀₂₂ = a₂₂₂} {p₂₁₂ : a₂₀₂ = a₂₂₂} {p₂₂₁ : a₂₂₀ = a₂₂₂}
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{s₁₁₀ : square p₀₁₀ p₂₁₀ p₁₀₀ p₁₂₀}
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{s₁₁₂ : square p₀₁₂ p₂₁₂ p₁₀₂ p₁₂₂}
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{s₀₁₁ : square p₀₁₀ p₀₁₂ p₀₀₁ p₀₂₁}
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{s₂₁₁ : square p₂₁₀ p₂₁₂ p₂₀₁ p₂₂₁}
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{s₁₀₁ : square p₁₀₀ p₁₀₂ p₀₀₁ p₂₀₁}
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{s₁₂₁ : square p₁₂₀ p₁₂₂ p₀₂₁ p₂₂₁}
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{b₁ b₂ b₃ b₄ : B}
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(c : cube s₁₁₀ s₁₁₂ s₀₁₁ s₂₁₁ s₁₀₁ s₁₂₁)
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definition idc [reducible] [constructor] := @cube.idc
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definition idcube [reducible] [constructor] (a : A) := @cube.idc A a
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variables (s₁₁₀ s₁₀₁)
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definition refl1 : cube s₁₁₀ s₁₁₀ vrfl vrfl vrfl vrfl :=
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by induction s₁₁₀; exact idc
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definition refl2 : cube vrfl vrfl s₁₁₀ s₁₁₀ hrfl hrfl :=
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by induction s₁₁₀; exact idc
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definition refl3 : cube hrfl hrfl hrfl hrfl s₁₀₁ s₁₀₁ :=
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by induction s₁₀₁; exact idc
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variables {s₁₁₀ s₁₀₁}
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definition rfl1 : cube s₁₁₀ s₁₁₀ vrfl vrfl vrfl vrfl := !refl1
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definition rfl2 : cube vrfl vrfl s₁₁₀ s₁₁₀ hrfl hrfl := !refl2
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definition rfl3 : cube hrfl hrfl hrfl hrfl s₁₀₁ s₁₀₁ := !refl3
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-- Variables for composition
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variables {a₄₀₀ a₄₀₂ a₄₂₀ a₄₂₂ : A}
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{p₃₀₀ : a₂₀₀ = a₄₀₀} {p₃₀₂ : a₂₀₂ = a₄₀₂} {p₃₂₀ : a₂₂₀ = a₄₂₀} {p₃₂₂ : a₂₂₂ = a₄₂₂}
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{p₄₀₁ : a₄₀₀ = a₄₀₂} {p₄₁₀ : a₄₀₀ = a₄₂₀} {p₄₁₂ : a₄₀₂ = a₄₂₂} {p₄₂₁ : a₄₂₀ = a₄₂₂}
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{s₃₀₁ : square p₃₀₀ p₃₀₂ p₂₀₁ p₄₀₁}
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{s₃₁₀ : square p₂₁₀ p₄₁₀ p₃₀₀ p₃₂₀}
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{s₃₁₂ : square p₂₁₂ p₄₁₂ p₃₀₂ p₃₂₂}
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{s₃₂₁ : square p₃₂₀ p₃₂₂ p₂₂₁ p₄₂₁}
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{s₄₁₁ : square p₄₁₀ p₄₁₂ p₄₀₁ p₄₂₁}
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(d : cube s₃₁₀ s₃₁₂ s₂₁₁ s₄₁₁ s₃₀₁ s₃₂₁)
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/- Composition of Cubes -/
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include c d
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definition concat1 : cube (s₁₁₀ ⬝h s₃₁₀) _ s₀₁₁ s₄₁₁ _ _ :=
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begin
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end
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omit c d
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definition eq_of_cube (c : cube s₁₁₀ s₁₁₂ s₀₁₁ s₂₁₁ s₁₀₁ s₁₂₁) :
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transpose s₁₀₁⁻¹ᵛ ⬝h s₁₁₀ ⬝h transpose s₁₂₁ =
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whisker_square (eq_bot_of_square s₀₁₁) (eq_bot_of_square s₂₁₁) idp idp s₁₁₂ :=
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by induction c; reflexivity
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definition eq_of_vdeg_cube {s s' : square p₀₁₀ p₂₁₀ p₁₀₀ p₁₂₀}
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(c : cube s s' vrfl vrfl vrfl vrfl) : s = s' :=
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begin
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induction s, exact eq_of_cube c
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end
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definition square_pathover [unfold 7]
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{f₁ : A → b₁ = b₂} {f₂ : A → b₃ = b₄} {f₃ : A → b₁ = b₃} {f₄ : A → b₂ = b₄}
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{p : a = a'}
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{q : square (f₁ a) (f₂ a) (f₃ a) (f₄ a)}
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{r : square (f₁ a') (f₂ a') (f₃ a') (f₄ a')}
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(s : cube q r (vdeg_square (ap f₁ p)) (vdeg_square (ap f₂ p))
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(vdeg_square (ap f₃ p)) (vdeg_square (ap f₄ p))) : q =[p] r :=
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by induction p;apply pathover_idp_of_eq;exact eq_of_vdeg_cube s
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/- Transporting along a square -/
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definition cube_transport110 {s₁₁₀' : square p₀₁₀ p₂₁₀ p₁₀₀ p₁₂₀}
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(p : s₁₁₀ = s₁₁₀') (c : cube s₁₁₀ s₁₁₂ s₀₁₁ s₂₁₁ s₁₀₁ s₁₂₁) :
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cube s₁₁₀' s₁₁₂ s₀₁₁ s₂₁₁ s₁₀₁ s₁₂₁ :=
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by induction p; exact c
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definition cube_transport112 {s₁₁₂' : square p₀₁₂ p₂₁₂ p₁₀₂ p₁₂₂}
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(p : s₁₁₂ = s₁₁₂') (c : cube s₁₁₀ s₁₁₂ s₀₁₁ s₂₁₁ s₁₀₁ s₁₂₁) :
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cube s₁₁₀ s₁₁₂' s₀₁₁ s₂₁₁ s₁₀₁ s₁₂₁ :=
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by induction p; exact c
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definition cube_transport011 {s₀₁₁' : square p₀₁₀ p₀₁₂ p₀₀₁ p₀₂₁}
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(p : s₀₁₁ = s₀₁₁') (c : cube s₁₁₀ s₁₁₂ s₀₁₁ s₂₁₁ s₁₀₁ s₁₂₁) :
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cube s₁₁₀ s₁₁₂ s₀₁₁' s₂₁₁ s₁₀₁ s₁₂₁ :=
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by induction p; exact c
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definition cube_transport211 {s₂₁₁' : square p₂₁₀ p₂₁₂ p₂₀₁ p₂₂₁}
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(p : s₂₁₁ = s₂₁₁') (c : cube s₁₁₀ s₁₁₂ s₀₁₁ s₂₁₁ s₁₀₁ s₁₂₁) :
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cube s₁₁₀ s₁₁₂ s₀₁₁ s₂₁₁' s₁₀₁ s₁₂₁ :=
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by induction p; exact c
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definition cube_transport101 {s₁₀₁' : square p₁₀₀ p₁₀₂ p₀₀₁ p₂₀₁}
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(p : s₁₀₁ = s₁₀₁') (c : cube s₁₁₀ s₁₁₂ s₀₁₁ s₂₁₁ s₁₀₁ s₁₂₁) :
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cube s₁₁₀ s₁₁₂ s₀₁₁ s₂₁₁ s₁₀₁' s₁₂₁ :=
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by induction p; exact c
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definition cube_transport121 {s₁₂₁' : square p₁₂₀ p₁₂₂ p₀₂₁ p₂₂₁}
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(p : s₁₂₁ = s₁₂₁') (c : cube s₁₁₀ s₁₁₂ s₀₁₁ s₂₁₁ s₁₀₁ s₁₂₁) :
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cube s₁₁₀ s₁₁₂ s₀₁₁ s₂₁₁ s₁₀₁ s₁₂₁' :=
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by induction p; exact c
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/- Each equality between squares leads to a cube which is degenerate in one
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dimension. -/
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definition deg1_cube {s₁₁₀' : square p₀₁₀ p₂₁₀ p₁₀₀ p₁₂₀} (p : s₁₁₀ = s₁₁₀') :
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cube s₁₁₀ s₁₁₀' vrfl vrfl vrfl vrfl :=
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by induction p; exact rfl1
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definition deg2_cube {s₁₁₀' : square p₀₁₀ p₂₁₀ p₁₀₀ p₁₂₀} (p : s₁₁₀ = s₁₁₀') :
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cube vrfl vrfl s₁₁₀ s₁₁₀' hrfl hrfl :=
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by induction p; exact rfl2
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definition deg3_cube {s₁₁₀' : square p₀₁₀ p₂₁₀ p₁₀₀ p₁₂₀} (p : s₁₁₀ = s₁₁₀') :
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cube hrfl hrfl hrfl hrfl s₁₁₀ s₁₁₀' :=
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by induction p; exact rfl3
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/- For each square of parralel equations, there are cubes where the square's
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sides appear in a degenerated way and two opposite sides are ids's -/
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section
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variables {a₀ a₁ : A} {p₀₀ p₀₂ p₂₀ p₂₂ : a₀ = a₁} {s₁₀ : p₀₀ = p₂₀}
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{s₁₂ : p₀₂ = p₂₂} {s₀₁ : p₀₀ = p₀₂} {s₂₁ : p₂₀ = p₂₂}
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(sq : square s₁₀ s₁₂ s₀₁ s₂₁)
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include sq
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definition ids1_cube_of_square : cube ids ids (hdeg_square s₀₁)
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(hdeg_square s₂₁) (hdeg_square s₁₀) (hdeg_square s₁₂) :=
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by induction p₀₀; induction sq; apply idc
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definition ids2_cube_of_square : cube (hdeg_square s₀₁) (hdeg_square s₂₁) ids ids
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(vdeg_square s₁₀) (vdeg_square s₁₂) :=
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by induction p₀₀; induction sq; apply idc
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definition ids3_cube_of_square : cube (vdeg_square s₀₁) (vdeg_square s₂₁)
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(vdeg_square s₁₀) (vdeg_square s₁₂) ids ids :=
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by induction p₀₀; induction sq; apply idc
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end
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/- Cube fillers -/
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section cube_fillers
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variables (s₁₁₀ s₁₁₂ s₀₁₁ s₂₁₁ s₁₀₁ s₁₂₁)
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definition cube_fill110 : Σ lid, cube lid s₁₁₂ s₀₁₁ s₂₁₁ s₁₀₁ s₁₂₁ :=
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begin
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induction s₀₁₁, induction s₂₁₁,
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let fillsq := square_fill_l (eq_of_vdeg_square s₁₀₁)
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(eq_of_hdeg_square s₁₁₂) (eq_of_vdeg_square s₁₂₁),
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apply sigma.mk,
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apply cube_transport101 (left_inv (vdeg_square_equiv _ _) s₁₀₁),
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apply cube_transport112 (left_inv (hdeg_square_equiv _ _) s₁₁₂),
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apply cube_transport121 (left_inv (vdeg_square_equiv _ _) s₁₂₁),
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apply ids2_cube_of_square, exact fillsq.2
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end
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definition cube_fill112 : Σ lid, cube s₁₁₀ lid s₀₁₁ s₂₁₁ s₁₀₁ s₁₂₁ :=
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begin
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induction s₀₁₁, induction s₂₁₁,
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let fillsq := square_fill_r (eq_of_vdeg_square s₁₀₁)
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(eq_of_hdeg_square s₁₁₀) (eq_of_vdeg_square s₁₂₁),
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apply sigma.mk,
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apply cube_transport101 (left_inv (vdeg_square_equiv _ _) s₁₀₁),
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apply cube_transport110 (left_inv (hdeg_square_equiv _ _) s₁₁₀),
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apply cube_transport121 (left_inv (vdeg_square_equiv _ _) s₁₂₁),
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apply ids2_cube_of_square, exact fillsq.2,
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end
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definition cube_fill011 : Σ lid, cube s₁₁₀ s₁₁₂ lid s₂₁₁ s₁₀₁ s₁₂₁ :=
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begin
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induction s₁₀₁, induction s₁₂₁,
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let fillsq := square_fill_t (eq_of_vdeg_square s₁₁₀) (eq_of_vdeg_square s₁₁₂)
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(eq_of_vdeg_square s₂₁₁),
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apply sigma.mk,
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apply cube_transport110 (left_inv (vdeg_square_equiv _ _) s₁₁₀),
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apply cube_transport211 (left_inv (vdeg_square_equiv _ _) s₂₁₁),
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apply cube_transport112 (left_inv (vdeg_square_equiv _ _) s₁₁₂),
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apply ids3_cube_of_square, exact fillsq.2,
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end
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definition cube_fill211 : Σ lid, cube s₁₁₀ s₁₁₂ s₀₁₁ lid s₁₀₁ s₁₂₁ :=
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begin
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induction s₁₀₁, induction s₁₂₁,
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let fillsq := square_fill_b (eq_of_vdeg_square s₀₁₁) (eq_of_vdeg_square s₁₁₀)
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(eq_of_vdeg_square s₁₁₂),
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apply sigma.mk,
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apply cube_transport011 (left_inv (vdeg_square_equiv _ _) s₀₁₁),
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apply cube_transport110 (left_inv (vdeg_square_equiv _ _) s₁₁₀),
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apply cube_transport112 (left_inv (vdeg_square_equiv _ _) s₁₁₂),
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apply ids3_cube_of_square, exact fillsq.2,
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end
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definition cube_fill101 : Σ lid, cube s₁₁₀ s₁₁₂ s₀₁₁ s₂₁₁ lid s₁₂₁ :=
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begin
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induction s₁₁₀, induction s₁₁₂,
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let fillsq := square_fill_t (eq_of_hdeg_square s₀₁₁) (eq_of_hdeg_square s₂₁₁)
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(eq_of_hdeg_square s₁₂₁),
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apply sigma.mk,
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apply cube_transport011 (left_inv (hdeg_square_equiv _ _) s₀₁₁),
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apply cube_transport211 (left_inv (hdeg_square_equiv _ _) s₂₁₁),
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apply cube_transport121 (left_inv (hdeg_square_equiv _ _) s₁₂₁),
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apply ids1_cube_of_square, exact fillsq.2,
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end
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definition cube_fill121 : Σ lid, cube s₁₁₀ s₁₁₂ s₀₁₁ s₂₁₁ s₁₀₁ lid :=
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begin
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induction s₁₁₀, induction s₁₁₂,
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let fillsq := square_fill_b (eq_of_hdeg_square s₁₀₁) (eq_of_hdeg_square s₀₁₁)
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(eq_of_hdeg_square s₂₁₁),
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apply sigma.mk,
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apply cube_transport101 (left_inv (hdeg_square_equiv _ _) s₁₀₁),
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apply cube_transport011 (left_inv (hdeg_square_equiv _ _) s₀₁₁),
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apply cube_transport211 (left_inv (hdeg_square_equiv _ _) s₂₁₁),
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apply ids1_cube_of_square, exact fillsq.2,
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end
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end cube_fillers
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end eq
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