50 lines
2.1 KiB
Text
50 lines
2.1 KiB
Text
namespace sigma
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open lift
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open sigma.ops sigma
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variables {A : Type} {B : A → Type}
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variables {a₁ a₂ : A} {b₁ : B a₁} {b₂ : B a₂}
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definition dpair.inj (H : ⟨a₁, b₁⟩ = ⟨a₂, b₂⟩) : Σ (e₁ : a₁ = a₂), eq.rec b₁ e₁ = b₂ :=
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down (sigma.no_confusion H (λ e₁ e₂, ⟨e₁, e₂⟩))
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definition dpair.inj₁ (H : ⟨a₁, b₁⟩ = ⟨a₂, b₂⟩) : a₁ = a₂ :=
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(dpair.inj H).1
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definition dpair.inj₂ (H : ⟨a₁, b₁⟩ = ⟨a₂, b₂⟩) : eq.rec b₁ (dpair.inj₁ H) = b₂ :=
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(dpair.inj H).2
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end sigma
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structure foo :=
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mk :: (A : Type) (B : A → Type) (a : A) (b : B a)
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set_option pp.implicit true
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namespace foo
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open lift sigma sigma.ops
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universe variables l₁ l₂
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variables {A₁ : Type.{l₁}} {B₁ : A₁ → Type.{l₂}} {a₁ : A₁} {b₁ : B₁ a₁}
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variables {A₂ : Type.{l₁}} {B₂ : A₂ → Type.{l₂}} {a₂ : A₂} {b₂ : B₂ a₂}
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definition foo.inj (H : mk A₁ B₁ a₁ b₁ = mk A₂ B₂ a₂ b₂) :
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Σ (e₁ : A₁ = A₂) (e₂ : eq.rec B₁ e₁ = B₂) (e₃ : eq.rec a₁ e₁ = a₂), eq.rec (eq.rec (eq.rec b₁ e₁) e₂) e₃ = b₂ :=
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down (foo.no_confusion H (λ e₁ e₂ e₃ e₄, ⟨e₁, e₂, e₃, e₄⟩))
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definition foo.inj₁ (H : mk A₁ B₁ a₁ b₁ = mk A₂ B₂ a₂ b₂) : A₁ = A₂ :=
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(foo.inj H).1
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definition foo.inj₂ (H : mk A₁ B₁ a₁ b₁ = mk A₂ B₂ a₂ b₂) : eq.rec B₁ (foo.inj₁ H) = B₂ :=
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(foo.inj H).2.1
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definition foo.inj₃ (H : mk A₁ B₁ a₁ b₁ = mk A₂ B₂ a₂ b₂) : eq.rec a₁ (foo.inj₁ H) = a₂ :=
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(foo.inj H).2.2.1
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definition foo.inj₄ (H : mk A₁ B₁ a₁ b₁ = mk A₂ B₂ a₂ b₂) : eq.rec (eq.rec (eq.rec b₁ (foo.inj₁ H)) (foo.inj₂ H)) (foo.inj₃ H) = b₂ :=
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(foo.inj H).2.2.2
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definition foo.inj_inv (e₁ : A₁ = A₂) (e₂ : eq.rec B₁ e₁ = B₂) (e₃ : eq.rec a₁ e₁ = a₂) (e₄ : eq.rec (eq.rec (eq.rec b₁ e₁) e₂) e₃ = b₂) :
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mk A₁ B₁ a₁ b₁ = mk A₂ B₂ a₂ b₂ :=
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eq.rec_on e₄ (eq.rec_on e₃ (eq.rec_on e₂ (eq.rec_on e₁ rfl)))
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end foo
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