(* Basic_1: removed theorems 9:
clear_pc3_trans pc3_ind_left
pc3_head_1 pc3_head_2 pc3_head_12 pc3_head_21
- pc3_pr2_fsubst0 pc3_pr2_fsubst0_back pc3_fsubst0
+ pc3_pr2_fqubst0 pc3_pr2_fqubst0_back pc3_fqubst0
pc3_gen_abst pc3_gen_abst_shift
*)
(* Basic_1: removed local theorems 6: