This site contains: mathematics courses and book; covers: image analysis, data analysis, and discrete modelling; provides: image analysis software. Created and run by Peter Saveliev.
Ball
From Intelligent Perception
$B( a, r ) = \{ x \in {\bf R}^n: | x - a | \leq r \}$, a closed ball,
$B( a, r ) = \{ x \in {\bf R}^n: | x - a | < r \}$, an open ball.
Which one should be clear from the context.
