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Completion and Tensor Product of Algebras

Let $A$ be a commutative ring with 1, $I$ an ideal in $A$, $B$ an $A$-algebra. I am trying to prove the following isomorphism of $A$-algebras: $$ \big( A^* \otimes _A B \big) ^* \cong B^* $$ "$^*$" de …
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3 votes

Completion and Tensor Product of Algebras

Thank you for your answer, Konstantin! In fact, since asking the question, my advisor, Prof. Dan Haran, has found a proof which does not use any Noetherity conditions: For any $A$-algebra $C$, we de …
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