proposition: Lemma Cauchy_kernel_symmetric : Cauchy_kernel d \is symmetric.
proof: Proof. rewrite Cauchy_symm_symh; apply rpred_sum => la _. by apply rpredZ; apply sympolP. Qed.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(ssrint rat ssralg ssrnum algC matrix vector) mathcomp(mpoly) tools partition ordtype antisym Schur_mpoly Schur_altdef sympoly homogsym permcent