lemma cpcs_refl: ∀L,T. L ⊢ T ⬌* T.
/2 width=1/ qed.
+lemma cpcs_sym: ∀L,T1,T2. L ⊢ T1 ⬌* T2 → L ⊢ T2 ⬌* T1.
+/3 width=1/ qed.
+
lemma cpcs_strap1: ∀L,T1,T,T2. L ⊢ T1 ⬌* T → L ⊢ T ⬌ T2 → L ⊢ T1 ⬌* T2.
/2 width=3/ qed.
#L #T1 #T2 #H @(cpcs_ind … H) -T2 // /3 width=3/
qed.
-(* Basic_1: removed theorems 6:
+(* Basic_1: removed theorems 9:
clear_pc3_trans pc3_ind_left
pc3_head_1 pc3_head_2 pc3_head_12 pc3_head_21
- Basic_1: removed local theorems 5:
+ pc3_pr2_fsubst0 pc3_pr2_fsubst0_back pc3_fsubst0
+ Basic_1: removed local theorems 6:
pc3_left_pr3 pc3_left_trans pc3_left_sym pc3_left_pc3 pc3_pc3_left
+ pc3_wcpr0_t_aux
*)