| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | open set | mathematics | An open set in mathematics is a set that does not contain its boundary points and is used in topology. | 5 |
| 2 | open set | science | An open set in science and mathematics excludes its boundary points. | 2 |
| 3 | open set | logic | An open set in mathematics refers to a set in topology where each point has a neighborhood entirely within the set. | 1 |