106 lines
4.2 KiB
Text
106 lines
4.2 KiB
Text
import macros tactic
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variable Sigma {A : (Type 1)} (B : A → (Type 1)) : (Type 1)
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variable Pair {A : (Type 1)} {B : A → (Type 1)} (a : A) (b : B a) : Sigma B
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variable Fst {A : (Type 1)} {B : A → (Type 1)} (p : Sigma B) : A
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variable Snd {A : (Type 1)} {B : A → (Type 1)} (p : Sigma B) : B (Fst p)
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axiom FstAx {A : (Type 1)} {B : A → (Type 1)} (a : A) (b : B a) : @Fst A B (Pair a b) = a
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axiom SndAx {A : (Type 1)} {B : A → (Type 1)} (a : A) (b : B a) : @Snd A B (Pair a b) == b
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scope
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-- Remark: A1 a1 A2 a2 A3 a3 A3 a4 are parameters for the definitions and theorems in this scope.
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variable A1 : (Type 1)
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variable a1 : A1
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variable A2 : A1 → (Type 1)
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variable a2 : A2 a1
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variable A3 : ∀ a1 : A1, A2 a1 → (Type 1)
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variable a3 : A3 a1 a2
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variable A4 : ∀ (a1 : A1) (a2 : A2 a1), A3 a1 a2 → (Type 1)
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variable a4 : A4 a1 a2 a3
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-- Pair type parameterized by a1 and a2
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definition A1A2_tuple_ty (a1 : A1) (a2 : A2 a1) : (Type 1)
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:= @Sigma (A3 a1 a2) (A4 a1 a2)
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-- Pair a3 a4
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definition tuple_34 : A1A2_tuple_ty a1 a2
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:= @Pair (A3 a1 a2) (A4 a1 a2) a3 a4
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-- Triple type parameterized by a1 a2 a3
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definition A1_tuple_ty (a1 : A1) : (Type 1)
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:= @Sigma (A2 a1) (A1A2_tuple_ty a1)
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-- Triple a2 a3 a4
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definition tuple_234 : A1_tuple_ty a1
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:= @Pair (A2 a1) (A1A2_tuple_ty a1) a2 tuple_34
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-- Quadruple type
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definition tuple_ty : (Type 1)
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:= @Sigma A1 A1_tuple_ty
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-- Quadruple a1 a2 a3 a4
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definition tuple_1234 : tuple_ty
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:= @Pair A1 A1_tuple_ty a1 tuple_234
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-- First element of the quadruple
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definition f_1234 : A1
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:= @Fst A1 A1_tuple_ty tuple_1234
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-- Rest of the quadruple (i.e., a triple)
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definition s_1234 : A1_tuple_ty f_1234
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:= @Snd A1 A1_tuple_ty tuple_1234
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theorem H_eq_a1 : f_1234 = a1
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:= @FstAx A1 A1_tuple_ty a1 tuple_234
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theorem H_eq_triple : s_1234 == tuple_234
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:= @SndAx A1 A1_tuple_ty a1 tuple_234
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-- Second element of the quadruple
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definition fs_1234 : A2 f_1234
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:= @Fst (A2 f_1234) (A1A2_tuple_ty f_1234) s_1234
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-- Rest of the triple (i.e., a pair)
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definition ss_1234 : A1A2_tuple_ty f_1234 fs_1234
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:= @Snd (A2 f_1234) (A1A2_tuple_ty f_1234) s_1234
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theorem H_eq_a2 : fs_1234 == a2
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:= have H1 : @Fst (A2 f_1234) (A1A2_tuple_ty f_1234) s_1234 == @Fst (A2 a1) (A1A2_tuple_ty a1) tuple_234,
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from hcongr (hcongr (hrefl (λ x, @Fst (A2 x) (A1A2_tuple_ty x))) (to_heq H_eq_a1)) H_eq_triple,
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have H2 : @Fst (A2 a1) (A1A2_tuple_ty a1) tuple_234 = a2,
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from FstAx _ _,
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htrans H1 (to_heq H2)
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theorem H_eq_pair : ss_1234 == tuple_34
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:= have H1 : @Snd (A2 f_1234) (A1A2_tuple_ty f_1234) s_1234 == @Snd (A2 a1) (A1A2_tuple_ty a1) tuple_234,
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from hcongr (hcongr (hrefl (λ x, @Snd (A2 x) (A1A2_tuple_ty x))) (to_heq H_eq_a1)) H_eq_triple,
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have H2 : @Snd (A2 a1) (A1A2_tuple_ty a1) tuple_234 == tuple_34,
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from SndAx _ _,
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htrans H1 H2
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-- Third element of the quadruple
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definition fss_1234 : A3 f_1234 fs_1234
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:= @Fst (A3 f_1234 fs_1234) (A4 f_1234 fs_1234) ss_1234
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-- Fourth element of the quadruple
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definition sss_1234 : A4 f_1234 fs_1234 fss_1234
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:= @Snd (A3 f_1234 fs_1234) (A4 f_1234 fs_1234) ss_1234
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theorem H_eq_a3 : fss_1234 == a3
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:= have H1 : @Fst (A3 f_1234 fs_1234) (A4 f_1234 fs_1234) ss_1234 == @Fst (A3 a1 a2) (A4 a1 a2) tuple_34,
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from hcongr (hcongr (hcongr (hrefl (λ x y z, @Fst (A3 x y) (A4 x y) z)) (to_heq H_eq_a1)) H_eq_a2) H_eq_pair,
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have H2 : @Fst (A3 a1 a2) (A4 a1 a2) tuple_34 = a3,
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from FstAx _ _,
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htrans H1 (to_heq H2)
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theorem H_eq_a4 : sss_1234 == a4
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:= have H1 : @Snd (A3 f_1234 fs_1234) (A4 f_1234 fs_1234) ss_1234 == @Snd (A3 a1 a2) (A4 a1 a2) tuple_34,
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from hcongr (hcongr (hcongr (hrefl (λ x y z, @Snd (A3 x y) (A4 x y) z)) (to_heq H_eq_a1)) H_eq_a2) H_eq_pair,
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have H2 : @Snd (A3 a1 a2) (A4 a1 a2) tuple_34 == a4,
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from SndAx _ _,
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htrans H1 H2
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eval tuple_1234
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eval f_1234
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eval fs_1234
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eval fss_1234
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eval sss_1234
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check H_eq_a1
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check H_eq_a2
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check H_eq_a3
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check H_eq_a4
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theorem f_quadruple : Fst (Pair a1 (Pair a2 (Pair a3 a4))) = a1
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:= H_eq_a1
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theorem fs_quadruple : Fst (Snd (Pair a1 (Pair a2 (Pair a3 a4)))) == a2
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:= H_eq_a2
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theorem fss_quadruple : Fst (Snd (Snd (Pair a1 (Pair a2 (Pair a3 a4))))) == a3
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:= H_eq_a3
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theorem sss_quadruple : Snd (Snd (Snd (Pair a1 (Pair a2 (Pair a3 a4))))) == a4
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:= H_eq_a4
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end
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-- Show the theorems with their parameters
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check f_quadruple
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check fs_quadruple
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check fss_quadruple
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check sss_quadruple
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exit
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