# Definition:Increasing/Sequence

< Definition:Increasing(Redirected from Definition:Increasing Sequence)

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## Definition

Let $\left({S, \preceq}\right)$ be a totally ordered set.

Let $A$ be a subset of the natural numbers $\N$.

Then a sequence $\left \langle {a_k} \right \rangle_{k \in A}$ of terms of $S$ is **increasing** if and only if:

- $\forall j, k \in A: j < k \implies a_j \preceq a_k$

### Real Sequence

The above definition for sequences is usually applied to real number sequences:

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

Then $\sequence {x_n}$ is **increasing** if and only if:

- $\forall n \in \N: x_n \le x_{n + 1}$

## Also known as

An **increasing sequence** is also known as an **ascending sequence**.