ON C-FIBRATIONS OVER PROJECTIVE CURVES

The goal of this paper is to present a modified version (GML) of ML invariant which should take into account rulings over a projective base and allow further stratification of smooth affine rational surfaces. We provide a non-trivial e where GML invariant is computed for a smooth affine rational surface admitting noC + -actions. We apply GML invariant to computing ML invariant of some threefolds.

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