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15 set "baseuri" "cic:/matita/test/".
19 theorem pippo: \forall (P,Q,R:nat \to Prop).
20 \forall x,y. x=y \to P x \to Q x \to R x.
24 theorem pippo: \forall (P,Q,R:nat \to Prop).
25 \forall x,y. x=y \to P x \to Q x \to R x.
26 intros. rewrite > H in y.