-lemma ifr_unwind_bi (f) (p) (q) (t1) (t2):
- t1 Ļµ š ā t1ā(pāš¦) Ļµ š ā
- t1 ā”š¢š[p,q] t2 ā ā¼[f]t1 ā”š¢š[āp,āq] ā¼[f]t2.
-#f #p #q #t1 #t2 #H1t1 #H2t1
-* #k * #H1k #Ht1 #Ht2
-@(ex_intro ā¦ (āāq)) @and3_intro
-[ -H1t1 -H2t1 -Ht1 -Ht2
+lemma ifr_unwind_bi (f) (t1) (t2) (r):
+ t1 Ļµ š ā r Ļµ š ā
+ t1 ā”š¢š[r] t2 ā ā¼[f]t1 ā”š¢š[ār] ā¼[f]t2.
+#f #t1 #t2 #r #H1t1 #H2r
+* #p #q #k #Hr #H1k #Ht1 #Ht2 destruct
+@(ex4_3_intro ā¦ (āp) (āq) (āāq))
+[ -H1t1 -H2r -H1k -Ht1 -Ht2 //
+| -H1t1 -H2r -Ht1 -Ht2