# Elementary interval

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of a partially ordered set

A subset consisting of two elements $a\leq b$ such that there are no other elements in the partially ordered set between them, i.e.

$$a\leq x\leq b\Rightarrow a=x\text{ or }a=b.$$

For (elementary) intervals in $\mathbf R$ see Interval and segment; Interval, closed; Interval, open.
One says that in this situation, $b$ is a covering element of, or covers $a$.