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Open ball
Definition
| $\langle d,X\rangle$ … metric space |
| $B:X\times \mathbb R_+^*\to \mathcal P(X)$ |
| $\langle r,a\rangle \mapsto B_a(r):= \{x\ |\ d(x,a)<r \}$ |
Discussion
Reference
Wikipedia: Ball (Mathematics)
Parents
Requirements
