@(\ 5a href="cic:/matita/arithmetics/nat/le_gen.def(1)"\ 6le_gen\ 5/a\ 6 ? n1) #i generalize in match p2; (elim i)
[(elim n2) // #m #Hind #p2 #_ #sub1 #sub2
>\ 5a href="cic:/matita/arithmetics/bigops/bigop_Sfalse.def(3)"\ 6bigop_Sfalse\ 5/a\ 6
@(\ 5a href="cic:/matita/arithmetics/nat/le_gen.def(1)"\ 6le_gen\ 5/a\ 6 ? n1) #i generalize in match p2; (elim i)
[(elim n2) // #m #Hind #p2 #_ #sub1 #sub2
>\ 5a href="cic:/matita/arithmetics/bigops/bigop_Sfalse.def(3)"\ 6bigop_Sfalse\ 5/a\ 6