proposition: Lemma diffKI t1 t2 : t2 `&` diff t1 t2 = \bot.
proof: Proof. by apply: eq_from_tnth => i; rewrite tnth_meet tnth_diff diffKI tnth_nseq. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)