Let $A$ be a commutative ring. Let $A[[x]]$ be the ring of formal power series in one variable. Can we determine the structure of the automorphism group of $A[[x]]$ over $A$?
This is a related question.
Let $A$ be a commutative ring. Let $A[[x]]$ be the ring of formal power series in one variable. Can we determine the structure of the automorphism group of $A[[x]]$ over $A$?
This is a related question.