6:05

Metric Spaces | Lecture 19 | Examples of Open Ball in Discrete Metric Space

7:23

Metric Spaces | Lecture 29 | Every Open Ball is an Open Set

5:31

Metric Spaces | Lecture 46 | Definition and Examples of Closed Set

7:20

Open Balls in a Metric Space

19:17

13. Topology of Metric Space - Open and Closed Ball (Definition & Examples)

11:08

Metric Spaces | Lecture 24 | Definition and Example of Open Set

19:10

Lecture 2b: Math. Analysis - open balls and closed balls

12:47

Balls are convex - Lec 29 - Real Analysis