(* Basic properties on funs *************************************************)
-(* Note: we need theese since matita blocks recursive δ when ι is blocked *)
+(* Note: we need theese since matita blocks recursive δ when ι is blocked *)
lemma fun0_xn: ∀f2,n1. 0 = fun0 n1 (↑f2).
* #n2 #f2 * //
qed.