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How to describe all ring homomorphisms $f: A \rightarrow B$, such that corresponding affine scheme morphism $f: Spec \, B \rightarrow Spec \, A$ is open immersion?

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    $\def\Spec{\operatorname{Spec}}$Don't we have $f\colon\Spec B \to \Spec A$?2012-10-30
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    Of course! I'm sorry. I've edited.2012-10-30
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    I asked the same question here: http://mathoverflow.net/questions/20782/ring-theoretic-characterization-of-open-affines2012-10-30

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