proposition: Lemma pr_predT mu : \P_[mu] predT = psum mu.
proof: Proof. by apply/eq_psum=> x; rewrite mul1r. Qed.
imports: mathcomp(all_ssreflect all_algebra) mathcomp.classical(boolp classical_sets mathcomp_extra) xfinmap ereal reals discrete topology realseq realsum