# Definition:Chain

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## Disambiguation

This page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.

**Chain** may refer to:

- Set Theory:
- A chain is a totally ordered subset $T$ of an ordered set $\left({S, \preceq}\right)$.

- Number Theory:
- A sociable chain is a sequence of positive integers such that the $n + 1$th term is the aliquot sum of the $n$th.