请教离散数学题
答案:2 悬赏:60 手机版
解决时间 2021-04-04 23:56
- 提问者网友：缘字诀
- 2021-04-04 12:06
请教离散数学题
最佳答案
- 五星知识达人网友：鱼芗
- 2021-04-04 13:28
f is not bijiection
proof:
we can find tow members of R , 1 and -1 such that
f(-1)=f(1) = 2/3
so f is not into.
because bijection must be both into and onto.
therefore f is not bijection.
proof:
we can find tow members of R , 1 and -1 such that
f(-1)=f(1) = 2/3
so f is not into.
because bijection must be both into and onto.
therefore f is not bijection.
全部回答
- 1楼网友：迟山
- 2021-04-04 14:36
不是。 因为 f(-x)=f(x).
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