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Whitehead module

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A module $M$ over an associative ring with identity $R$ such that the $\mathrm{Ext}$ functor $$ \mathrm{Ext}_R^1(M,R) = 0 \ . $$

See Whitehead test module.

How to Cite This Entry:
Whitehead module. Encyclopedia of Mathematics. URL: http://www.encyclopediaofmath.org/index.php?title=Whitehead_module&oldid=39378