proposition: Lemma diff_xlnx_1 : diff_xlnx 1 = 0.
proof: Proof. by rewrite /diff_xlnx subRR xlnx_0 xlnx_1 subRR. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum) mathcomp(Rstruct) Reals Lra ssrR realType_ext Reals_ext Ranalysis_ext logb convex