2015-12-06 07:52:16 +00:00
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import data.finset data.set
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2015-11-21 23:02:50 +00:00
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open set finset
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2015-12-06 22:33:21 +00:00
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set_option blast.strategy "cc"
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2015-11-21 23:02:50 +00:00
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structure finite_set [class] {T : Type} (xs : set T) :=
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(to_finset : finset T) (is_equiv : to_set to_finset = xs)
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definition finset_set.is_subsingleton [instance] (T : Type) (xs : set T) : subsingleton (finite_set xs) :=
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begin
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constructor, intro a b,
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induction a with f₁ h₁,
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induction b with f₂ h₂,
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subst xs,
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2015-12-10 18:37:55 +00:00
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note e := to_set.inj h₂,
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2015-11-21 23:02:50 +00:00
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subst e
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end
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/- Add some instances for finite_sets -/
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variable {A : Type}
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definition finite_set_empty [instance] : finite_set (∅:set A) := sorry
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definition finite_set_finset [instance] (fxs : finset A) : finite_set (to_set fxs) := sorry
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2015-12-13 19:15:10 +00:00
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definition finite_set_insert [instance] (xs : set A) [finite_set xs] (x : A) : finite_set (insert x xs) := sorry
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definition finite_set_union [instance] (xs : set A) [finite_set xs] (ys : set A) [finite_set ys] : finite_set (xs ∪ ys) := sorry
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definition finite_set_inter1 [instance] (xs : set A) [finite_set xs] (ys : set A) [decidable_pred ys] : finite_set (xs ∩ ys) := sorry
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definition finite_set_inter2 [instance] (xs : set A) [finite_set xs] (ys : set A) [decidable_pred ys] : finite_set (ys ∩ xs) := sorry
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definition finite_set_set_of [instance] (xs : set A) [finite_set xs] : finite_set (set.set_of xs) := sorry
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2015-11-21 23:02:50 +00:00
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/- Defined cardinality using finite_set type class -/
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2015-12-13 19:15:10 +00:00
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noncomputable definition mycard {T : Type} (xs : set T) [finite_set xs] :=
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2015-11-21 23:02:50 +00:00
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finset.card (to_finset xs)
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/- Congruence closure still works :-) -/
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definition tst
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(A : Type) (s₁ s₂ s₃ s₄ s₅ s₆ : set A)
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2015-12-13 19:15:10 +00:00
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[finite_set s₁] [finite_set s₂]
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[finite_set s₃] [finite_set s₄]
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[decidable_pred s₅] [decidable_pred s₆] :
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2015-11-21 23:02:50 +00:00
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s₁ = s₂ → s₃ = s₄ → s₆ = s₅ → mycard ((s₁ ∪ s₃) ∩ s₅) = mycard ((s₂ ∪ s₄) ∩ s₆) :=
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by blast
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print tst
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