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What would be a good source for polynomial expressions over non-commutative rings, such that the variable wouldn't have to commute with the coefficients, so that the substitution of a value from the underlying ring in place of the variable would be a ring homomorphism?

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migrated from mathoverflow.net Jul 30 '13 at 22:37

This question came from our site for professional mathematicians.

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You could have a look at Bourbaki's Algèbre VIII.1.4 (the new edition from 2012.)

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