設P 是严格偏好, R 是偏好
you also need R is transitive
從R 開始,
P 有很清楚的定義: xPy iff xRy and not yRx
換句話說,你要証的是 xRz and not zRx
1.証xRz: xPy and yRz imply xRy and yRz, transitivity implies xRz
2. 証 not zRx , 可以自己試試
設P 是严格偏好, R 是偏好
you also need R is transitive
從R 開始,
P 有很清楚的定義: xPy iff xRy and not yRx
換句話說,你要証的是 xRz and not zRx
1.証xRz: xPy and yRz imply xRy and yRz, transitivity implies xRz
2. 証 not zRx , 可以自己試試