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Open ball
Definition
$\langle d,X\rangle$ … metric space |
$a\in X$ |
$B_a:\mathbb R_+^*\to \mathcal P(X)$ |
$B_a(r):= \{x\ |\ d(x,a)<r \}$ |
Discussion
Reference
Wikipedia: Ball (Mathematics)
This is an old revision of the document!
$\langle d,X\rangle$ … metric space |
$a\in X$ |
$B_a:\mathbb R_+^*\to \mathcal P(X)$ |
$B_a(r):= \{x\ |\ d(x,a)<r \}$ |
Wikipedia: Ball (Mathematics)