Question on affine schemes

From: bockermann <fstrunk@xxxxxx>
Date: Thu, 14 Jun 2007 14:54:26 -0700

Hello,
suppose X=spec(A) is an affine scheme and spec(B) an open subpace of
the underlying space of X. Let D(f)={P\in Spec B | (f)\notsubset P }
be an open subset of spec (B), then D(f) is isomorphic to spec(B_f)
where B_f is a localisation.
Is there an g in A such that spec(A_g) is isomorphic to spec(B_f)?

Thanks,
Bockermann

.

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