(Edit) My question is as follows: My previous question was about a kind of "strict-transform birational" invariant not birational invariants as usual. So I just delete the question since it complicated to state the definition and I want to think for by myself. Sorry about that.
Is degree a "strict -transform" birational invariant for surfaces in the complex projective 3-space?
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$\begingroup$ Are you still asking a question? Is you 'previous question' in fact this question? $\endgroup$– David Roberts ♦Commented Jan 13, 2012 at 4:08
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2$\begingroup$ In order to delete the question, you should click on "delete" at the bottom of it. Otherwise, it remains visible. $\endgroup$– Francesco PolizziCommented Jan 13, 2012 at 8:52
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