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Let f:C 2 ->C be a polynomial function. It is well known that there exists a finite set A C such that the restriction of f to C 2 -f -1 (A) is a differentiable fibration onto C-A. Following Broughton in (Proc. Symp. Pure Math. 40 (1983) 167) we call the smallest of such A's the set of atypical values of f and write it A f . Let F be a generic fiber of f. The...
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