* #n1 #f1 * #n2 #f2 #H cases (eq_stream_inv_seq ??? H) -H [2,3,4,5,6,7: // ]
#Hf * -n2 cases n1 -n1 /3 width=5 by eq_push/
#n @eq_next /3 width=5 by eq_seq/
qed.
* #n1 #f1 * #n2 #f2 #H cases (eq_stream_inv_seq ??? H) -H [2,3,4,5,6,7: // ]
#Hf * -n2 cases n1 -n1 /3 width=5 by eq_push/
#n @eq_next /3 width=5 by eq_seq/
qed.