fact: CoInductive T2ltn_xor_geq m n : bool -> bool -> Set := | T2LtnNotGeq of m < n : T2ltn_xor_geq m n false true | T2GeqNotLtn of n <= m : T2ltn_xor_geq m n true false.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(fintype bigop)