fact: Definition bin_conv_inv (f: nat -> int) n := with_sgn n (\sum_(i<n.+1) with_sgn i (f i) *+ 'C(n,i)).
imports: mathcomp(ssreflect ssrfun ssrbool eqtype) mathcomp(ssrnat seq choice fintype binomial) mathcomp(bigop ssralg poly ssrint) gaia(ssete7)