# Definition:Subdivision (Real Analysis)/Normal Subdivision

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## Definition

Let $\closedint a b$ be a closed interval of the set $\R$ of real numbers.

Let $P = \set {x_0, x_1, x_2, \ldots, x_{n - 1}, x_n}$ form a (finite) subdivision of $\closedint a b$.

$P$ is a **normal subdivision of $\closedint a b$** if and only if:

- the length of every interval of the form $\closedint {x_i} {x_{i + 1} }$ is the same as every other.

That is, if and only if:

- $\exists c \in \R_{> 0}: \forall i \in \N_{< n}: x_{i + 1} - x_i = c$

## Also known as

Some sources use the term **partition** for the concept of a subdivision.

However, the latter term has a different and more general definition, so its use is deprecated on $\mathsf{Pr} \infty \mathsf{fWiki}$.

## Historical Note

The name **normal subdivision** has been specifically coined for $\mathsf{Pr} \infty \mathsf{fWiki}$, as there appears to be no standard name for this concept in the literature.