最終更新日：2025/11/27
In the subspace topology, every point of the discrete set has an open neighborhood that contains no other points of the set.
正解を見る
In the subspace topology, every point of the discrete set has an open neighborhood that contains no other points of the set.
音声機能が動作しない場合はこちらをご確認ください
編集履歴（0）
