Cyclic module
From AoPSWiki
A cyclic module (or more specifically, a cyclic left 
-module
over a ring ) is a module that is generated by a single
element—the analogue of a cyclic group for modules.
In a left -module 
, the cyclic submodule generated by an element
is often denoted 
.
Every cyclic left -module is isomorphic to a quotient module of the
left-regular module over (that is, a quotient module of
as a left -module).
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