proposition: Lemma Rle_order: order Rle.
proof: Proof. constructor; red; intros. - apply Rle_refl. - eapply Rle_trans; eassumption. - now apply Rle_antisym. Qed.
imports: RTopology SeparatednessAxioms RFuncContinuity UniformTopology ContinuousFactorization Coq(Description Max Psatz ClassicalChoice) ZornsLemma(Proj1SigInjective) UrysohnsLemma