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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.

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    Can you do the case in which $A$ is a field?2012-07-21
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    If you know the answer, please post it. I prefer not to answer this question since I'm the OP. This does not necessarily mean that I know the answer.2012-07-21
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    If you browse a bit the site, you will notice that it is usually a good idea (and other users appreciate it) to explain what you already know about what you ask in the question itself.2012-07-21
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    What if I know the full answer? This is just a question. This does not necessarily mean that that is the case.2012-07-21
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    As it should have been made clear to you by now, you can answer your own question. in any case, **please** ask meta questions in the meta site, not here.2012-07-21
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    I prefer not to answer my own question for some reason.2012-07-21
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    Then don't... Is there a point to all this which should not be better treated in the meta site?2012-07-21

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