fact: Definition CharacFunc {R : ConstructiveReals} {X : Set} (A : X -> Prop) : @PartialFunction R X.
imports: Logic.ConstructiveEpsilon QArith ConstructiveReals ConstructiveAbs ConstructiveMinMax ConstructiveSum ConstructivePower ConstructiveLimits ConstructiveDiagonal ConstructivePartialFunctions CMTbase CMTIntegrableFunctions CMTFullSets CMTPositivity