proposition: Lemma Rabs_neq_rev : forall r, Rabs r <> 0 -> r <> 0.
proof: Proof. intros r Hr Hf ; rewrite Hf, Rabs_R0 in Hr ; apply Hr ; reflexivity. Qed.
imports: Reals Rpser_def Rpser_def_simpl Rinterval Rsequence_def Rsequence_base_facts Rsequence_subsequence Rsequence_rewrite_facts Rsequence_cv_facts Rsequence_facts Rsequence_bound_facts Rsequence_sums_facts Rpow_facts PeanoNat Lra MyRIneq MyNat MyNNR