Last Updated:2025/11/26

The half-open interval [0, 1) contains 0 but not 1, so it is neither open nor closed in the usual topology on R.

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The half-open interval [0, 1) contains 0 but not 1, so it is neither open nor closed in the usual topology on R.

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半開区間 [0, 1) は 0 を含み 1 を含まないため、通常の R の位相では開でも閉でもありません。

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