Boundary point - boundary point

Japanese: 境界点 - きょうかいてん
Boundary point - boundary point
A point in a topological space that is neither an interior point nor an exterior point of M. The neighborhood of a boundary point of M always includes both points of M and points that do not belong to M.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:
〘名〙 位相空間における部分集合Mの内点でも外点でもない点のMに対する称。Mの境界点の近傍は必ずMの点もMに属さない点も含む。

出典 精選版 日本国語大辞典精選版 日本国語大辞典について 情報

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