proposition: Fact nary_addv_subproof : mxsum_spec (vs2mx (\sum_(i <- r | P i) unwrap (S_ i))) (\sum_(i <- r | P i) unwrap (addv_dim (S_ i))).
proof: Proof. by rewrite vs2mx_sum; apply: proper_mxsumP. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)