最終更新日：2025/11/24
In the standard topology on R, 0 is a limit point of the set {1/n : n ∈ N} because every neighborhood of 0 contains some 1/n distinct from 0.
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In the standard topology on R, 0 is a limit point of the set {1/n : n ∈ N} because every neighborhood of 0 contains some 1/n distinct from 0.
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