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Indecomposable Module


A non-zero module which is not the direct sum of two of its proper submodules. The negation of indecomposable is, of course, decomposable. An abstract vector space is indecomposable iff it has dimension 1.

As a consequence of Kronecker basis theorem, an Abelian group is indecomposable iff it is either isomorphic to Z or to Z_q, where q is a prime power. This is not the case for q=6, and in fact we have

 Z_6=<2^_> direct sum <3^_>=Z_2 direct sum Z_3.

See also

Indecomposable

This entry contributed by Margherita Barile

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References

Rowen, L. "Indecomposable Modules and LE-Modules." §2.9 in Ring Theory, Vol. 1. San Diego, CA: Academic Press, pp. 237-261, 1988.

Referenced on Wolfram|Alpha

Indecomposable Module

Cite this as:

Barile, Margherita. "Indecomposable Module." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/IndecomposableModule.html

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