Wedderburn-Artin theorem

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A theorem which fully describes the structure of associative Artinian rings without nilpotent ideals. An associative ring $R$ has the minimum condition for right ideals and has no nilpotent ideals if and only if $R$ is the direct sum of a finite number of ideals, each of which is isomorphic to a complete matrix ring of finite order over a suitable skew-field; this decomposition into a direct sum is unique apart from the ordering of its terms. This theorem was first obtained by J. Wedderburn for finite-dimensional algebras over a field, and was proved by E. Artin [1] in its final formulation.


[1] E. Artin, "The influence of J.H.M. Wedderburn on the development of modern algebra" Bull. Amer. Math. Soc. , 56 (1950) pp. 65–72



[a1] J.H.M. Wedderburn, "Lectures on matrices" , Dover, reprint (1964)
[a2] C. Faith, "Algebra: rings, modules, and categories" , 1 , Springer (1973) pp. 380, 369
[a3] P.M. Cohn, "Algebra" , 2 , Wiley (1989) pp. 174ff
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