public void Set(Matrix2x2 m)
 {
     m00 = m.m00;
     m01 = m.m01;
     m10 = m.m10;
     m11 = m.m11;
 }
 public Matrix2x2 Multiply(Matrix2x2 x)
 {
     return(new Matrix2x2(
                m00 * x.m00 + m01 * x.m10,
                m00 * x.m01 + m01 * x.m11,
                m10 * x.m00 + m11 * x.m10,
                m10 * x.m01 + m11 * x.m11));
 }