fact: Definition coefs n i := [seq (castmx (erefl _, exp3n _) (invmx (zmxR (ctmat n)))) i ord0 | i <- enum 'I__]`_i.
imports: mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq choice path fintype) mathcomp(div bigop order ssralg poly polydiv ssrnum perm zmodp ssrint) mathcomp(polyorder polyrcf interval matrix mxtens)