MultivariateMultiply
final class MultivariateMultiply(y:Expression<Real[_,_]>, z:Expression<Real[_]>) < MultivariateBinaryExpression<Expression<Real[_,_]>, Expression<Real[_]>, Real[_,_], Real[_], Real[_,_], Real[_], Real[_]>(y, z)
Lazy multivariate multiply.