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Degree of the fibres of an elliptic fibration

Alexandru Buium (1983)

Annales de l'institut Fourier

Let X B an elliptic fibration with general fibre F . Let n e , n s , n a , n v be the minima of the non-zero intersection numbers ( , F ) where runs successively through the following sets: effective divisors on X , invertible sheaves spanned by global sections, ample divisors and very ample divisors. Let m be the maximum of the multiplicities of the fibres of X B . We prove that n e = n s if and only if n e 2 m and that n a = n v if and only if n a 3 m .

Differential Equations associated to Families of Algebraic Cycles

Pedro Luis del Angel, Stefan Müller-Stach (2008)

Annales de l’institut Fourier

We develop a theory of differential equations associated to families of algebraic cycles in higher Chow groups (i.e., motivic cohomology groups). This formalism is related to inhomogenous Picard–Fuchs type differential equations. For a families of K3 surfaces the corresponding non–linear ODE turns out to be similar to Chazy’s equation.

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