proposition: Lemma CR_prop10 k: natp k -> ~inc (CR_partial_sum f k) (CR_limit f).
proof: Proof. move => kN /Zo_P [tq [n nN ltn] ]. by case: (qle_ltT (CR_prop8 nN kN) ltn). Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat)