Definition:Closed Disk
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Definition
Let $V$ be a vectorspace and $x \in V$, $r \in \R$. Then the closed disk $\bar{D}$ centered at $x$ with radius $r$ is the set:
$\bar{D}(x, r) := \{v \in V | \| x - v \| \le r\}$Remarks
- $\| \cdot \|$ is a norm over $V$.
- The word disk usually implies that $V$ has two dimensions. In higher dimensions sphere or ball are more commonly used to describe this set.
- See also Definition:Closed Ball