39 lines
626 B
Text
39 lines
626 B
Text
structure myprod (A B : Type) :=
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(fst : A) (snd : B)
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variable p : myprod nat nat
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variable f : nat → nat
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#check p^.fst
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#check p^.1
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#check p^.2
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#check p^.snd
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#check f p^.1
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#check p^.1 + p^.2
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example (A B : Type) : A × B → B × A :=
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λ h, ⟨h^.2, h^.1⟩
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example (A B : Type) : A × B → B × A :=
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λ h, ⟨h^.snd, h^.fst⟩
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structure position (A B : Type) :=
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(x : A) (y : B)
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structure car :=
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(pos : position nat nat) (cheap : bool)
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#check λ c : car, c^.pos^.x
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#check λ c : car, c^.fst
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#check λ c : car, c^.0
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#check λ c : car, c^.3
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#check λ n : nat, n^.1
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#check p.1
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#check p.2
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#check λ c : car, c.1.2
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