| 1  X  X^2 |
   | 1  Y  Y^2 | = (Y-X)(Z-X)(Z-Y)
   | 1  Z  Z^2 |
バンデルモンドの行列式
   | 1  X  X^2 |      | 1   X     X^2  |
   | 1  Y  Y^2 | =   | 0  Y-X  Y^2ーX^2 |  = | y-X  Y^2-X^2 |
   | 1  Z  Z^2 |      | 0  Z-X  Z^2ーX^2 |     | Z-X  Z^2-X^2 |
(Y-X)(Z-X)| 1  Y+X |  =  (Y-X)(Z-X)| 1  Y+X |  = (Y-X)(Z-X)(Z-Y)
        | 1  Z+X |             | 0  Z-Y |