cic:/matita/logic/equality/sym_eq.con
cic:/matita/logic/equality/trans_eq.con
cic:/matita/logic/equality/eq_ind.con
- cic:/matita/logic/equality/eq_elim_r.con.
+ cic:/matita/logic/equality/eq_elim_r.con
+ cic:/matita/logic/equality/eq_f.con
+ cic:/matita/logic/equality/eq_f1.con. (* \x.sym (eq_f x) *)
+
theorem eq_f: \forall A,B:Type.\forall f:A\to B.
\forall x,y:A. x=y \to f x = f y.