fact: Hypothesis cvg_left : (f @ b^'-) --> f b.
imports: mathcomp(all_ssreflect ssralg ssrint ssrnum finmap) mathcomp(matrix interval zmodp vector fieldext falgebra) mathcomp(mathcomp_extra boolp classical_sets set_interval) mathcomp(functions cardinality) ereal reals signed topology prodnormedzmodule normedtype derive realfun itv HB(structures)