# Chain ring

From Encyclopedia of Mathematics

*left*

A ring (usually assumed to be associative and with a unit element) in which the left ideals form a chain. In other words, $R$ is a left chain ring if $R$ is a left chain module over itself. Every left chain ring is local. Right chain rings are defined similarly. Commutative chain rings are often called normed rings. See also Discretely-normed ring.

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Chain ring.

*Encyclopedia of Mathematics.*URL: http://encyclopediaofmath.org/index.php?title=Chain_ring&oldid=31942

This article was adapted from an original article by L.A. Skornyakov (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article