# Definition:Bounded Subset of Normed Vector Space

This page is about Bounded in the context of Normed Vector Space. For other uses, see Bounded.

## Definition

Let $M = \struct {X, \norm {\, \cdot \,}}$ be a normed vector space.

Let $M' \subseteq X$.

### Definition 1

$M'$ is bounded (in $M$) if and only if:

$\exists x \in X, C \in \R_{> 0}: \forall y \in Y: \norm {x - y} \le C$

### Definition 2

$M'$ is bounded (in $M$) if and only if:

$\exists \epsilon \in \R_{>0} : \exists x \in X : Y \subseteq \map {B_\epsilon^-} x$

where $\map {B_\epsilon^-} x$ is a closed ball in $M$.