public void DotProduct()
{
var a = new v8 <Motion>(+1, +2, +3, +4, +5, +6);
var b = new v8 <Force>(-1, -2, -3, -4, -5, -6);
var pwr0 = Math_.Dot(a, b);
var pwr1 = Math_.Dot(b, a);
Assert.True(Math_.FEql(pwr0, -91));
Assert.True(Math_.FEql(pwr1, -91));
}