**Module (mathematics) - Wikipedia**
https://en.wikipedia.org/wiki/Module_(mathematics)

In mathematics, a module is one of the fundamental algebraic structures used in abstract algebra. A module over a ring is a generalization of the notion of vector space over a field, wherein the corresponding scalars are the elements of an arbitrary given ring and a multiplication is defined between elements of the ring and elements of the module. A module taking its scalars from a ring R is called an R-module. Thus, a module, like a vector space, is an additive abelian group; a product is defin

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