Mathematics
Undergraduate
解答解説をお願いします🙏
問81 (X,6) 位相空間とし, UV∈ (X の開集
合) とする. 次を示せ.
(1) 任意の MC Xに対して, USM UOM.
=
(2) UnV=0⇒ Ūnv = 0.
(3) UnV=0⇒ (σ)³n (V)³ = 0.
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