proposition: Fact coord_is_scalar n (X : n.-tuple vT) i : scalar (coord X i).
proof: Proof. by move=> k u v; rewrite unlock linearP mulmxDl -scalemxAl !mxE. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)