かいしゅうごう
開集合
1. open setMathematics
2. Open setIn topology, a set is called an open set if it is a neighborhood of every point . When dealing with metric spaces, this can be intuitively interpreted as saying that every can be "moved" some non-zero distance, in any direction, and it will still lie within . The notion of an open set provides a fundamental way to speak of nearness of points in a topological space, without explicitly having a concept of distance defined.
Read “Open set” on English Wikipedia
Read “開集合” on Japanese Wikipedia
Read “Open set” on DBpedia
Read “Open set” on English Wikipedia
Read “開集合” on Japanese Wikipedia
Read “Open set” on DBpedia
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