                new Vector(new[] { new Number(4), new Number(0), new Number(6) }),
                new Vector(new[] { new Number(-7), new Number(8), new Number(9) })
            });
            var expected = new Matrix(new[]
            {
                new Vector(new[] { new Number(-7), new Number(8), new Number(9) }),
                new Vector(new[] { new Number(4), new Number(0), new Number(6) }),
                new Vector(new[] { new Number(1), new Number(-2), new Number(3) })

            });