fact: Definition nlim u : \bar R := if @idP `[< exists l, `[< ncvg u l >] >] is ReflectT Px then xchoose (asboolP _ Px) else -oo.
imports: mathcomp(all_ssreflect all_algebra) mathcomp.bigenough.bigenough mathcomp.classical(boolp classical_sets functions) mathcomp.classical(mathcomp_extra) xfinmap ereal reals discrete topology