fact: Definition limit12_hyp a b c:= if c is cons a1 b1 c1 n1 d1 then (n1 == 0) && (d1 == zero) && ( ((a == a1) && (b < b1)) || ((a < a1) && (b < c))) else false.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(fintype bigop)