Corollary dep_iff_non_dep_functional_rel_reification :
  FunctionalRelReification <-> DependentFunctionalRelReification.

Theorem constructive_definite_descr_excluded_middle : (forall A : Type, ConstructiveDefiniteDescription_on A) -> (forall P:Prop, P \/ ~ P) -> (forall P:Prop, {P} + {~ P}).