fact: Definition Domain_intersect_countable {R : ConstructiveReals} {X : Set} (fn : nat -> @PartialFunction R X) : PartialFunction X := XinfiniteSumAbs(fun n => Xscale 0 (fn n)).
imports: List QArith ConstructiveReals ConstructiveAbs ConstructiveMinMax ConstructiveSum ConstructiveLimits ConstructiveRcomplete