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 General curves on algebraic surfaces

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We give upper bounds on the genus of a curve with general moduli assuming that it can be embedded in a projective nonsingular surface $Y$ so that $\dim(|C|) > 0$. We find such bounds for all types of surfaces of intermediate Kodaira dimension and, under mild restrictions, for surfaces of general type whose minimal model $Z$ satisfies the Castelnuovo inequality $K Z^2 \ge 3\chi(\O Z) - 10$. In this last case we obtain $g \le 19$. In the other cases considered the bounds are lower.

Author: Edoardo Sernesi


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