Mathematics
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単射ですか?

R f: R2 C1 → 3c2 T C2

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✨ Best Answer ✨

違う。
(x1,x2),(x1',x2)を持ってきたときに、像は同じだけど、上の2点はR2で異なる2点なんで。

ほんとだ〜〜〜!!!!

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