| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | open set | mathematics | In mathematics, an open set is a set that does not contain its boundary points. | 2 |
| 2 | open set | mathematics | In mathematics, an open set is a concept in topology where every point has a neighborhood contained entirely within the set. | 1 |
| 3 | open set | mathematics | In mathematics and science, an open set is a concept used in topology to describe a set that does not include its boundary points. | 1 |
| 4 | open set | mathematics | In mathematics and science, an open set is a set that does not contain its boundary points. | 1 |