Category:Examples of Limits Superior

From ProofWiki
Jump to navigation Jump to search

This category contains examples of Limit Superior.

Let $\sequence {x_n}$ be a bounded sequence in $\R$.


Definition 1

Let $L$ be the set of all real numbers which are the limit of some subsequence of $\sequence {x_n}$.


From Existence of Maximum and Minimum of Bounded Sequence, $L$ has a maximum.

This maximum is called the limit superior.

It can be denoted:

$\displaystyle \map {\limsup_{n \mathop \to \infty} } {x_n} = \overline l$


Definition 2

The limit superior of $\sequence {x_n}$ is defined and denoted as:

$\displaystyle \map {\limsup_{n \mathop \to \infty} } {x_n} = \inf \set {\sup_{m \mathop \ge n} x_m: n \in \N}$