Differences
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open_ball [2013/09/08 17:40] nikolaj |
open_ball [2014/03/21 11:11] |
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| - | ===== Open ball ===== | ||
| - | ==== Definition ==== | ||
| - | | @#88DDEE: $\langle d,X\rangle$ ... metric space | | ||
| - | | @#88DDEE: $a\in X$ | | ||
| - | | @#FFBB00: $B_a:\mathbb R_+^*\to \mathcal P(X)$ | | ||
| - | | @#FFBB00: $B_a(r):= \{x\ |\ d(x,a)<r \}$ | | ||
| - | |||
| - | ==== Discussion ==== | ||
| - | === Reference === | ||
| - | Wikipedia: [[http://en.wikipedia.org/wiki/Ball_%28mathematics%29|Ball (Mathematics)]] | ||
| - | ==== Parents ==== | ||
| - | === Requirements === | ||
| - | [[Metric]] | ||
