why3doc index index
module Spec use option.Option use int.Int use Nat.Nat use Functions.Func use OptionFuncs.Funcs use Sum.Sum use Firstorder_symbol_spec.Spec use Firstorder_term_spec.Spec use Firstorder_formula_spec.Spec use Firstorder_formula_list_spec.Spec type tableau 'b0 'b1 = | Root | Node (tableau 'b0 'b1) (fo_formula 'b0 'b1) (fo_formula_list 'b0 'b1) function nat_size_tableau (t:tableau 'b0 'b1) : nat = match t with | Root -> let s = one_nat in s | Node v0 v1 v2 -> let s = one_nat in let s = add_nat (nat_size_fo_formula_list v2) s in let s = add_nat (nat_size_fo_formula v1) s in let s = add_nat (nat_size_tableau v0) s in s end with size_tableau (t:tableau 'b0 'b1) : int = match t with | Root -> let s = 1 in s | Node v0 v1 v2 -> let s = 1 in let s = size_fo_formula_list v2 + s in let s = size_fo_formula v1 + s in let s = size_tableau v0 + s in s end let rec lemma size_positive_lemma_tableau (t:tableau 'b0 'b1) : unit ensures { size_tableau t > 0 } variant { nat_to_int (nat_size_tableau t) } = match t with | Root -> () | Node v0 v1 v2 -> size_positive_lemma_tableau v0 ; size_positive_lemma_fo_formula v1 ; size_positive_lemma_fo_formula_list v2 ; () end function rename_tableau (t:tableau 'b0 'b1) (s0:'b0 -> 'c0) (s1:'b1 -> 'c1) : tableau 'c0 'c1 = match t with | Root -> Root | Node v0 v1 v2 -> Node (rename_tableau v0 s0 s1) (rename_fo_formula v1 s0 s1) (rename_fo_formula_list v2 s0 s1) end let rec lemma renaming_composition_lemma_tableau (t:tableau 'b0 'b1) (s10:'b0 -> 'c0) (s11:'b1 -> 'c1) (s20:'c0 -> 'd0) (s21:'c1 -> 'd1) : unit ensures { rename_tableau (rename_tableau t s10 s11) s20 s21 = rename_tableau t (rcompose s10 s20) (rcompose s11 s21) } variant { size_tableau t } = match t with | Root -> () | Node v0 v1 v2 -> renaming_composition_lemma_tableau v0 s10 s11 s20 s21 ; renaming_composition_lemma_fo_formula v1 s10 s11 s20 s21 ; renaming_composition_lemma_fo_formula_list v2 s10 s11 s20 s21 ; () end let rec lemma renaming_identity_lemma_tableau (t:tableau 'b0 'b1) : unit ensures { rename_tableau t identity identity = t } variant { size_tableau t } = match t with | Root -> () | Node v0 v1 v2 -> renaming_identity_lemma_tableau v0 ; renaming_identity_lemma_fo_formula v1 ; renaming_identity_lemma_fo_formula_list v2 ; () end function subst_tableau (t:tableau 'b0 'b1) (s0:'b0 -> (symbol 'c0)) (s1:'b1 -> (fo_term 'c0 'c1)) : tableau 'c0 'c1 = match t with | Root -> Root | Node v0 v1 v2 -> Node (subst_tableau v0 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity)) (subst_fo_formula v1 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity)) (subst_fo_formula_list v2 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity)) end let rec lemma rename_then_subst_composition_lemma_tableau (t:tableau 'b0 'b1) (s10:'b0 -> 'c0) (s11:'b1 -> 'c1) (s20:'c0 -> (symbol 'd0)) (s21:'c1 -> (fo_term 'd0 'd1)) : unit ensures { subst_tableau (rename_tableau t s10 s11) s20 s21 = subst_tableau t (rcompose s10 s20) (rcompose s11 s21) } variant { size_tableau t } = match t with | Root -> () | Node v0 v1 v2 -> rename_then_subst_composition_lemma_tableau v0 s10 s11 (rename_subst_symbol s20 identity) (rename_subst_fo_term s21 identity identity) ; rename_then_subst_composition_lemma_fo_formula v1 s10 s11 (rename_subst_symbol s20 identity) (rename_subst_fo_term s21 identity identity) ; rename_then_subst_composition_lemma_fo_formula_list v2 s10 s11 (rename_subst_symbol s20 identity) (rename_subst_fo_term s21 identity identity) ; () end let rec lemma subst_then_rename_composition_lemma_tableau (t:tableau 'b0 'b1) (s10:'b0 -> (symbol 'c0)) (s11:'b1 -> (fo_term 'c0 'c1)) (s20:'c0 -> 'd0) (s21:'c1 -> 'd1) : unit ensures { rename_tableau (subst_tableau t s10 s11) s20 s21 = subst_tableau t (rename_subst_symbol s10 s20) (rename_subst_fo_term s11 s20 s21) } variant { size_tableau t } = match t with | Root -> () | Node v0 v1 v2 -> subst_then_rename_composition_lemma_tableau v0 (rename_subst_symbol s10 identity) (rename_subst_fo_term s11 identity identity) s20 s21 ; subst_then_rename_composition_lemma_fo_formula v1 (rename_subst_symbol s10 identity) (rename_subst_fo_term s11 identity identity) s20 s21 ; subst_then_rename_composition_lemma_fo_formula_list v2 (rename_subst_symbol s10 identity) (rename_subst_fo_term s11 identity identity) s20 s21 ; () end let rec lemma subst_composition_lemma_tableau (t:tableau 'b0 'b1) (s10:'b0 -> (symbol 'c0)) (s11:'b1 -> (fo_term 'c0 'c1)) (s20:'c0 -> (symbol 'd0)) (s21:'c1 -> (fo_term 'd0 'd1)) : unit ensures { subst_tableau (subst_tableau t s10 s11) s20 s21 = subst_tableau t (subst_compose_symbol s10 s20) (subst_compose_fo_term s11 s20 s21) } variant { size_tableau t } = match t with | Root -> () | Node v0 v1 v2 -> subst_composition_lemma_tableau v0 (rename_subst_symbol s10 identity) (rename_subst_fo_term s11 identity identity) (rename_subst_symbol s20 identity) (rename_subst_fo_term s21 identity identity) ; subst_composition_lemma_fo_formula v1 (rename_subst_symbol s10 identity) (rename_subst_fo_term s11 identity identity) (rename_subst_symbol s20 identity) (rename_subst_fo_term s21 identity identity) ; subst_composition_lemma_fo_formula_list v2 (rename_subst_symbol s10 identity) (rename_subst_fo_term s11 identity identity) (rename_subst_symbol s20 identity) (rename_subst_fo_term s21 identity identity) ; () end let rec lemma subst_identity_lemma_tableau (t:tableau 'b0 'b1) : unit ensures { subst_tableau t subst_id_symbol subst_id_fo_term = t } variant { size_tableau t } = match t with | Root -> () | Node v0 v1 v2 -> subst_identity_lemma_tableau v0 ; subst_identity_lemma_fo_formula v1 ; subst_identity_lemma_fo_formula_list v2 ; () end let rec lemma renaming_preserve_size_tableau (t:tableau 'b0 'b1) (s0:'b0 -> 'c0) (s1:'b1 -> 'c1) : unit ensures { size_tableau (rename_tableau t s0 s1) = size_tableau t } variant { size_tableau t } = match t with | Root -> () | Node v0 v1 v2 -> renaming_preserve_size_tableau v0 (s0) (s1) ; renaming_preserve_size_fo_formula v1 (s0) (s1) ; renaming_preserve_size_fo_formula_list v2 (s0) (s1) ; () end predicate is_symbol_free_var_in_tableau (x:'b0) (t:tableau 'b0 'b1) = match t with | Root -> false | Node v0 v1 v2 -> is_symbol_free_var_in_tableau x v0 \/ is_symbol_free_var_in_fo_formula x v1 \/ is_symbol_free_var_in_fo_formula_list x v2 end with is_fo_term_free_var_in_tableau (x:'b1) (t:tableau 'b0 'b1) = match t with | Root -> false | Node v0 v1 v2 -> is_fo_term_free_var_in_tableau x v0 \/ is_fo_term_free_var_in_fo_formula x v1 \/ is_fo_term_free_var_in_fo_formula_list x v2 end let rec ghost rename_free_var_constructive_inversion_symbol_tableau (x:'c0) (t:tableau 'b0 'b1) (s0:'b0 -> 'c0) (s1:'b1 -> 'c1) : 'b0 requires { is_symbol_free_var_in_tableau x (rename_tableau t s0 s1) } ensures { is_symbol_free_var_in_tableau result t /\ s0 result = x } variant { size_tableau t } = match t with | Root -> absurd | Node v0 v1 v2 -> if is_symbol_free_var_in_tableau x (rename_tableau v0 s0 s1) then let sumx = rename_free_var_constructive_inversion_symbol_tableau x v0 s0 s1 in sumx else if is_symbol_free_var_in_fo_formula x (rename_fo_formula v1 s0 s1) then let sumx = rename_free_var_constructive_inversion_symbol_fo_formula x v1 s0 s1 in sumx else if is_symbol_free_var_in_fo_formula_list x (rename_fo_formula_list v2 s0 s1) then let sumx = rename_free_var_constructive_inversion_symbol_fo_formula_list x v2 s0 s1 in sumx else absurd end with lemma rename_free_var_inversion_symbol_tableau (x:'c0) (t:tableau 'b0 'b1) (s0:'b0 -> 'c0) (s1:'b1 -> 'c1) : unit requires { is_symbol_free_var_in_tableau x (rename_tableau t s0 s1) } ensures { exists y:'b0. is_symbol_free_var_in_tableau y t /\ s0 y = x } variant { 1 + size_tableau t } = let sumx = rename_free_var_constructive_inversion_symbol_tableau x t s0 s1 in () with ghost rename_free_var_constructive_inversion_fo_term_tableau (x:'c1) (t:tableau 'b0 'b1) (s0:'b0 -> 'c0) (s1:'b1 -> 'c1) : 'b1 requires { is_fo_term_free_var_in_tableau x (rename_tableau t s0 s1) } ensures { is_fo_term_free_var_in_tableau result t /\ s1 result = x } variant { size_tableau t } = match t with | Root -> absurd | Node v0 v1 v2 -> if is_fo_term_free_var_in_tableau x (rename_tableau v0 s0 s1) then let sumx = rename_free_var_constructive_inversion_fo_term_tableau x v0 s0 s1 in sumx else if is_fo_term_free_var_in_fo_formula x (rename_fo_formula v1 s0 s1) then let sumx = rename_free_var_constructive_inversion_fo_term_fo_formula x v1 s0 s1 in sumx else if is_fo_term_free_var_in_fo_formula_list x (rename_fo_formula_list v2 s0 s1) then let sumx = rename_free_var_constructive_inversion_fo_term_fo_formula_list x v2 s0 s1 in sumx else absurd end with lemma rename_free_var_inversion_fo_term_tableau (x:'c1) (t:tableau 'b0 'b1) (s0:'b0 -> 'c0) (s1:'b1 -> 'c1) : unit requires { is_fo_term_free_var_in_tableau x (rename_tableau t s0 s1) } ensures { exists y:'b1. is_fo_term_free_var_in_tableau y t /\ s1 y = x } variant { 1 + size_tableau t } = let sumx = rename_free_var_constructive_inversion_fo_term_tableau x t s0 s1 in () let rec lemma rename_free_var_propagation_symbol_tableau (x:'b0) (t:tableau 'b0 'b1) (s0:'b0 -> 'c0) (s1:'b1 -> 'c1) : unit ensures { is_symbol_free_var_in_tableau x t -> is_symbol_free_var_in_tableau (s0 x) (rename_tableau t s0 s1) } variant { size_tableau t } = match t with | Root -> () | Node v0 v1 v2 -> rename_free_var_propagation_symbol_tableau x v0 (s0) (s1) ; rename_free_var_propagation_symbol_fo_formula x v1 (s0) (s1) ; rename_free_var_propagation_symbol_fo_formula_list x v2 (s0) (s1) ; () end with lemma rename_free_var_propagation_fo_term_tableau (x:'b1) (t:tableau 'b0 'b1) (s0:'b0 -> 'c0) (s1:'b1 -> 'c1) : unit ensures { is_fo_term_free_var_in_tableau x t -> is_fo_term_free_var_in_tableau (s1 x) (rename_tableau t s0 s1) } variant { size_tableau t } = match t with | Root -> () | Node v0 v1 v2 -> rename_free_var_propagation_fo_term_tableau x v0 (s0) (s1) ; rename_free_var_propagation_fo_term_fo_formula x v1 (s0) (s1) ; rename_free_var_propagation_fo_term_fo_formula_list x v2 (s0) (s1) ; () end let rec ghost subst_free_var_constructive_inversion_symbol_tableau (x:'c0) (t:tableau 'b0 'b1) (s0:'b0 -> (symbol 'c0)) (s1:'b1 -> (fo_term 'c0 'c1)) : sum ('b0) ('b1) requires { is_symbol_free_var_in_tableau x (subst_tableau t s0 s1) } ensures { let sumx = result in match sumx with | Left sumx -> is_symbol_free_var_in_tableau sumx t /\ is_symbol_free_var_in_symbol x (s0 sumx) | Right sumx -> is_fo_term_free_var_in_tableau sumx t /\ is_symbol_free_var_in_fo_term x (s1 sumx) end } variant { size_tableau t } = match t with | Root -> absurd | Node v0 v1 v2 -> if is_symbol_free_var_in_tableau x (subst_tableau v0 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity)) then let sumx = subst_free_var_constructive_inversion_symbol_tableau x v0 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity) in match sumx with | Left sumx -> let y = rename_free_var_constructive_inversion_symbol_symbol x (eval s0 sumx) identity in assert { y = x } ; Left sumx | Right sumx -> Right (let y = rename_free_var_constructive_inversion_symbol_fo_term x (eval s1 sumx) identity identity in assert { y = x } ; sumx) end else if is_symbol_free_var_in_fo_formula x (subst_fo_formula v1 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity)) then let sumx = subst_free_var_constructive_inversion_symbol_fo_formula x v1 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity) in match sumx with | Left sumx -> let y = rename_free_var_constructive_inversion_symbol_symbol x (eval s0 sumx) identity in assert { y = x } ; Left sumx | Right sumx -> Right (let y = rename_free_var_constructive_inversion_symbol_fo_term x (eval s1 sumx) identity identity in assert { y = x } ; sumx) end else if is_symbol_free_var_in_fo_formula_list x (subst_fo_formula_list v2 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity)) then let sumx = subst_free_var_constructive_inversion_symbol_fo_formula_list x v2 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity) in match sumx with | Left sumx -> let y = rename_free_var_constructive_inversion_symbol_symbol x (eval s0 sumx) identity in assert { y = x } ; Left sumx | Right sumx -> Right (let y = rename_free_var_constructive_inversion_symbol_fo_term x (eval s1 sumx) identity identity in assert { y = x } ; sumx) end else absurd end with lemma subst_free_var_inversion_symbol_tableau (x:'c0) (t:tableau 'b0 'b1) (s0:'b0 -> (symbol 'c0)) (s1:'b1 -> (fo_term 'c0 'c1)) : unit requires { is_symbol_free_var_in_tableau x (subst_tableau t s0 s1) } ensures { (exists y:'b0. is_symbol_free_var_in_tableau y t /\ is_symbol_free_var_in_symbol x (s0 y)) \/ (exists y:'b1. is_fo_term_free_var_in_tableau y t /\ is_symbol_free_var_in_fo_term x (s1 y)) } variant { 1 + size_tableau t } = let sumx = subst_free_var_constructive_inversion_symbol_tableau x t s0 s1 in match sumx with | Left sumx -> () | Right sumx -> () end with ghost subst_free_var_constructive_inversion_fo_term_tableau (x:'c1) (t:tableau 'b0 'b1) (s0:'b0 -> (symbol 'c0)) (s1:'b1 -> (fo_term 'c0 'c1)) : 'b1 requires { is_fo_term_free_var_in_tableau x (subst_tableau t s0 s1) } ensures { let sumx = result in is_fo_term_free_var_in_tableau sumx t /\ is_fo_term_free_var_in_fo_term x (s1 sumx) } variant { size_tableau t } = match t with | Root -> absurd | Node v0 v1 v2 -> if is_fo_term_free_var_in_tableau x (subst_tableau v0 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity)) then let sumx = subst_free_var_constructive_inversion_fo_term_tableau x v0 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity) in let y = rename_free_var_constructive_inversion_fo_term_fo_term x (eval s1 sumx) identity identity in assert { y = x } ; sumx else if is_fo_term_free_var_in_fo_formula x (subst_fo_formula v1 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity)) then let sumx = subst_free_var_constructive_inversion_fo_term_fo_formula x v1 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity) in let y = rename_free_var_constructive_inversion_fo_term_fo_term x (eval s1 sumx) identity identity in assert { y = x } ; sumx else if is_fo_term_free_var_in_fo_formula_list x (subst_fo_formula_list v2 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity)) then let sumx = subst_free_var_constructive_inversion_fo_term_fo_formula_list x v2 (rename_subst_symbol s0 identity) (rename_subst_fo_term s1 identity identity) in let y = rename_free_var_constructive_inversion_fo_term_fo_term x (eval s1 sumx) identity identity in assert { y = x } ; sumx else absurd end with lemma subst_free_var_inversion_fo_term_tableau (x:'c1) (t:tableau 'b0 'b1) (s0:'b0 -> (symbol 'c0)) (s1:'b1 -> (fo_term 'c0 'c1)) : unit requires { is_fo_term_free_var_in_tableau x (subst_tableau t s0 s1) } ensures { (exists y:'b1. is_fo_term_free_var_in_tableau y t /\ is_fo_term_free_var_in_fo_term x (s1 y)) } variant { 1 + size_tableau t } = let sumx = subst_free_var_constructive_inversion_fo_term_tableau x t s0 s1 in () let rec lemma subst_free_var_propagation_symbol_symbol_tableau (x:'b0) (y:'c0) (t:tableau 'b0 'b1) (s0:'b0 -> (symbol 'c0)) (s1:'b1 -> (fo_term 'c0 'c1)): unit ensures { is_symbol_free_var_in_tableau x t /\ is_symbol_free_var_in_symbol y (s0 x) -> is_symbol_free_var_in_tableau y (subst_tableau t s0 s1) } variant { size_tableau t } = match t with | Root -> () | Node v0 v1 v2 -> subst_free_var_propagation_symbol_symbol_tableau x y v0 ((rename_subst_symbol s0 identity)) ((rename_subst_fo_term s1 identity identity)) ; rename_free_var_propagation_symbol_symbol y (eval s0 x) identity ; assert { is_symbol_free_var_in_symbol y (s0 x) -> is_symbol_free_var_in_symbol y (eval ((rename_subst_symbol s0 identity)) x) } ; subst_free_var_propagation_symbol_symbol_fo_formula x y v1 ((rename_subst_symbol s0 identity)) ((rename_subst_fo_term s1 identity identity)) ; rename_free_var_propagation_symbol_symbol y (eval s0 x) identity ; assert { is_symbol_free_var_in_symbol y (s0 x) -> is_symbol_free_var_in_symbol y (eval ((rename_subst_symbol s0 identity)) x) } ; subst_free_var_propagation_symbol_symbol_fo_formula_list x y v2 ((rename_subst_symbol s0 identity)) ((rename_subst_fo_term s1 identity identity)) ; rename_free_var_propagation_symbol_symbol y (eval s0 x) identity ; assert { is_symbol_free_var_in_symbol y (s0 x) -> is_symbol_free_var_in_symbol y (eval ((rename_subst_symbol s0 identity)) x) } ; () end with lemma subst_free_var_propagation_fo_term_symbol_tableau (x:'b1) (y:'c0) (t:tableau 'b0 'b1) (s0:'b0 -> (symbol 'c0)) (s1:'b1 -> (fo_term 'c0 'c1)): unit ensures { is_fo_term_free_var_in_tableau x t /\ is_symbol_free_var_in_fo_term y (s1 x) -> is_symbol_free_var_in_tableau y (subst_tableau t s0 s1) } variant { size_tableau t } = match t with | Root -> () | Node v0 v1 v2 -> subst_free_var_propagation_fo_term_symbol_tableau x y v0 ((rename_subst_symbol s0 identity)) ((rename_subst_fo_term s1 identity identity)) ; rename_free_var_propagation_symbol_fo_term y (eval s1 x) identity identity ; assert { is_symbol_free_var_in_fo_term y (s1 x) -> is_symbol_free_var_in_fo_term y (eval ((rename_subst_fo_term s1 identity identity)) x) } ; subst_free_var_propagation_fo_term_symbol_fo_formula x y v1 ((rename_subst_symbol s0 identity)) ((rename_subst_fo_term s1 identity identity)) ; rename_free_var_propagation_symbol_fo_term y (eval s1 x) identity identity ; assert { is_symbol_free_var_in_fo_term y (s1 x) -> is_symbol_free_var_in_fo_term y (eval ((rename_subst_fo_term s1 identity identity)) x) } ; subst_free_var_propagation_fo_term_symbol_fo_formula_list x y v2 ((rename_subst_symbol s0 identity)) ((rename_subst_fo_term s1 identity identity)) ; rename_free_var_propagation_symbol_fo_term y (eval s1 x) identity identity ; assert { is_symbol_free_var_in_fo_term y (s1 x) -> is_symbol_free_var_in_fo_term y (eval ((rename_subst_fo_term s1 identity identity)) x) } ; () end with lemma subst_free_var_propagation_fo_term_fo_term_tableau (x:'b1) (y:'c1) (t:tableau 'b0 'b1) (s0:'b0 -> (symbol 'c0)) (s1:'b1 -> (fo_term 'c0 'c1)): unit ensures { is_fo_term_free_var_in_tableau x t /\ is_fo_term_free_var_in_fo_term y (s1 x) -> is_fo_term_free_var_in_tableau y (subst_tableau t s0 s1) } variant { size_tableau t } = match t with | Root -> () | Node v0 v1 v2 -> subst_free_var_propagation_fo_term_fo_term_tableau x y v0 ((rename_subst_symbol s0 identity)) ((rename_subst_fo_term s1 identity identity)) ; rename_free_var_propagation_fo_term_fo_term y (eval s1 x) identity identity ; assert { is_fo_term_free_var_in_fo_term y (s1 x) -> is_fo_term_free_var_in_fo_term y (eval ((rename_subst_fo_term s1 identity identity)) x) } ; subst_free_var_propagation_fo_term_fo_term_fo_formula x y v1 ((rename_subst_symbol s0 identity)) ((rename_subst_fo_term s1 identity identity)) ; rename_free_var_propagation_fo_term_fo_term y (eval s1 x) identity identity ; assert { is_fo_term_free_var_in_fo_term y (s1 x) -> is_fo_term_free_var_in_fo_term y (eval ((rename_subst_fo_term s1 identity identity)) x) } ; subst_free_var_propagation_fo_term_fo_term_fo_formula_list x y v2 ((rename_subst_symbol s0 identity)) ((rename_subst_fo_term s1 identity identity)) ; rename_free_var_propagation_fo_term_fo_term y (eval s1 x) identity identity ; assert { is_fo_term_free_var_in_fo_term y (s1 x) -> is_fo_term_free_var_in_fo_term y (eval ((rename_subst_fo_term s1 identity identity)) x) } ; () end let rec lemma free_var_equivalence_of_subst_tableau (t:tableau 'b0 'b1) (s10:'b0 -> (symbol 'c0)) (s20:'b0 -> (symbol 'c0)) (s11:'b1 -> (fo_term 'c0 'c1)) (s21:'b1 -> (fo_term 'c0 'c1)) : unit requires { forall x:'b0. is_symbol_free_var_in_tableau x t -> s10 x = s20 x } requires { forall x:'b1. is_fo_term_free_var_in_tableau x t -> s11 x = s21 x } ensures { subst_tableau t s10 s11 = subst_tableau t s20 s21 } variant { size_tableau t } = match t with | Root -> () | Node v0 v1 v2 -> assert { forall x:'b0. is_symbol_free_var_in_tableau x v0 -> is_symbol_free_var_in_tableau x t } ; assert { forall x:'b1. is_fo_term_free_var_in_tableau x v0 -> is_fo_term_free_var_in_tableau x t } ; free_var_equivalence_of_subst_tableau v0 ((rename_subst_symbol s10 identity)) ((rename_subst_symbol s20 identity)) ((rename_subst_fo_term s11 identity identity)) ((rename_subst_fo_term s21 identity identity)) ; assert { forall x:'b0. is_symbol_free_var_in_fo_formula x v1 -> is_symbol_free_var_in_tableau x t } ; assert { forall x:'b1. is_fo_term_free_var_in_fo_formula x v1 -> is_fo_term_free_var_in_tableau x t } ; free_var_equivalence_of_subst_fo_formula v1 ((rename_subst_symbol s10 identity)) ((rename_subst_symbol s20 identity)) ((rename_subst_fo_term s11 identity identity)) ((rename_subst_fo_term s21 identity identity)) ; assert { forall x:'b0. is_symbol_free_var_in_fo_formula_list x v2 -> is_symbol_free_var_in_tableau x t } ; assert { forall x:'b1. is_fo_term_free_var_in_fo_formula_list x v2 -> is_fo_term_free_var_in_tableau x t } ; free_var_equivalence_of_subst_fo_formula_list v2 ((rename_subst_symbol s10 identity)) ((rename_subst_symbol s20 identity)) ((rename_subst_fo_term s11 identity identity)) ((rename_subst_fo_term s21 identity identity)) ; () end let lemma free_var_equivalence_of_rename_tableau (t:tableau 'b0 'b1) (s10:'b0 -> 'c0) (s20:'b0 -> 'c0) (s11:'b1 -> 'c1) (s21:'b1 -> 'c1) : unit requires { forall x:'b0. is_symbol_free_var_in_tableau x t -> s10 x = s20 x } requires { forall x:'b1. is_fo_term_free_var_in_tableau x t -> s11 x = s21 x } ensures { rename_tableau t s10 s11 = rename_tableau t s20 s21 } = free_var_equivalence_of_subst_tableau t (subst_of_rename_symbol s10) (subst_of_rename_symbol s20) (subst_of_rename_fo_term s11) (subst_of_rename_fo_term s21) let rec lemma free_var_derive_equivalence_of_subst_tableau (t:tableau 'b0 'b1) (s10:'b0 -> (symbol 'c0)) (s20:'b0 -> (symbol 'c0)) (s11:'b1 -> (fo_term 'c0 'c1)) (s21:'b1 -> (fo_term 'c0 'c1)) : unit ensures { forall x:'b0. is_symbol_free_var_in_tableau x t -> s10 x = s20 x } ensures { forall x:'b1. is_fo_term_free_var_in_tableau x t -> s11 x = s21 x } requires { subst_tableau t s10 s11 = subst_tableau t s20 s21 } variant { size_tableau t } = match t with | Root -> () | Node v0 v1 v2 -> free_var_derive_equivalence_of_subst_tableau v0 ((rename_subst_symbol s10 identity)) ((rename_subst_symbol s20 identity)) ((rename_subst_fo_term s11 identity identity)) ((rename_subst_fo_term s21 identity identity)); assert { (forall x:'b0, y0:'c0. is_symbol_free_var_in_tableau x v0 -> rename_symbol (s10 x) identity = eval ((rename_subst_symbol s10 identity)) x = eval ((rename_subst_symbol s20 identity)) x = rename_symbol (s20 x) identity && s10 x = rename_symbol (rename_symbol (s10 x) identity) identity = rename_symbol (rename_symbol (s20 x) identity) identity = s20 x && s10 x = s20 x) && forall x:'b0. is_symbol_free_var_in_tableau x v0 -> s10 x = s20 x }; assert { (forall x:'b1, y0:'c0, y1:'c1. is_fo_term_free_var_in_tableau x v0 -> rename_fo_term (s11 x) identity identity = eval ((rename_subst_fo_term s11 identity identity)) x = eval ((rename_subst_fo_term s21 identity identity)) x = rename_fo_term (s21 x) identity identity && s11 x = rename_fo_term (rename_fo_term (s11 x) identity identity) identity identity = rename_fo_term (rename_fo_term (s21 x) identity identity) identity identity = s21 x && s11 x = s21 x) && forall x:'b1. is_fo_term_free_var_in_tableau x v0 -> s11 x = s21 x } ; free_var_derive_equivalence_of_subst_fo_formula v1 ((rename_subst_symbol s10 identity)) ((rename_subst_symbol s20 identity)) ((rename_subst_fo_term s11 identity identity)) ((rename_subst_fo_term s21 identity identity)); assert { (forall x:'b0, y0:'c0. is_symbol_free_var_in_fo_formula x v1 -> rename_symbol (s10 x) identity = eval ((rename_subst_symbol s10 identity)) x = eval ((rename_subst_symbol s20 identity)) x = rename_symbol (s20 x) identity && s10 x = rename_symbol (rename_symbol (s10 x) identity) identity = rename_symbol (rename_symbol (s20 x) identity) identity = s20 x && s10 x = s20 x) && forall x:'b0. is_symbol_free_var_in_fo_formula x v1 -> s10 x = s20 x }; assert { (forall x:'b1, y0:'c0, y1:'c1. is_fo_term_free_var_in_fo_formula x v1 -> rename_fo_term (s11 x) identity identity = eval ((rename_subst_fo_term s11 identity identity)) x = eval ((rename_subst_fo_term s21 identity identity)) x = rename_fo_term (s21 x) identity identity && s11 x = rename_fo_term (rename_fo_term (s11 x) identity identity) identity identity = rename_fo_term (rename_fo_term (s21 x) identity identity) identity identity = s21 x && s11 x = s21 x) && forall x:'b1. is_fo_term_free_var_in_fo_formula x v1 -> s11 x = s21 x } ; free_var_derive_equivalence_of_subst_fo_formula_list v2 ((rename_subst_symbol s10 identity)) ((rename_subst_symbol s20 identity)) ((rename_subst_fo_term s11 identity identity)) ((rename_subst_fo_term s21 identity identity)); assert { (forall x:'b0, y0:'c0. is_symbol_free_var_in_fo_formula_list x v2 -> rename_symbol (s10 x) identity = eval ((rename_subst_symbol s10 identity)) x = eval ((rename_subst_symbol s20 identity)) x = rename_symbol (s20 x) identity && s10 x = rename_symbol (rename_symbol (s10 x) identity) identity = rename_symbol (rename_symbol (s20 x) identity) identity = s20 x && s10 x = s20 x) && forall x:'b0. is_symbol_free_var_in_fo_formula_list x v2 -> s10 x = s20 x }; assert { (forall x:'b1, y0:'c0, y1:'c1. is_fo_term_free_var_in_fo_formula_list x v2 -> rename_fo_term (s11 x) identity identity = eval ((rename_subst_fo_term s11 identity identity)) x = eval ((rename_subst_fo_term s21 identity identity)) x = rename_fo_term (s21 x) identity identity && s11 x = rename_fo_term (rename_fo_term (s11 x) identity identity) identity identity = rename_fo_term (rename_fo_term (s21 x) identity identity) identity identity = s21 x && s11 x = s21 x) && forall x:'b1. is_fo_term_free_var_in_fo_formula_list x v2 -> s11 x = s21 x } ; () end let lemma free_var_derive_equivalence_of_rename_tableau (t:tableau 'b0 'b1) (s10:'b0 -> 'c0) (s20:'b0 -> 'c0) (s11:'b1 -> 'c1) (s21:'b1 -> 'c1) : unit ensures { forall x:'b0. is_symbol_free_var_in_tableau x t -> s10 x = s20 x } ensures { forall x:'b1. is_fo_term_free_var_in_tableau x t -> s11 x = s21 x } requires { rename_tableau t s10 s11 = rename_tableau t s20 s21 } = free_var_derive_equivalence_of_subst_tableau t (subst_of_rename_symbol s10) (subst_of_rename_symbol s20) (subst_of_rename_fo_term s11) (subst_of_rename_fo_term s21); assert { forall x:'b0. (subst_of_rename_symbol s10 x:symbol 'c0) = (subst_of_rename_symbol s20 x:symbol 'c0) -> (Var_symbol (s10 x):symbol 'c0) = (Var_symbol (s20 x):symbol 'c0) && s10 x = s20 x }; assert { forall x:'b1. (subst_of_rename_fo_term s11 x:fo_term 'c0 'c1) = (subst_of_rename_fo_term s21 x:fo_term 'c0 'c1) -> (Var_fo_term (s11 x):fo_term 'c0 'c1) = (Var_fo_term (s21 x):fo_term 'c0 'c1) && s11 x = s21 x } end
Generated by why3doc 1.7.0