The respiratory release of carbon dioxide (CO(2)) from the land surface is a major flux in the global carbon cycle, antipodal to photosynthetic CO(2) uptake. Understanding the sensitivity ofâ€¦ (More)

We construct and study two series of curves whose Jacobians admit complex multiplication. The curves arise as quotients of Galois coverings of the projective line with Galois group metacyclic groupsâ€¦ (More)

In this paper we obtain bounds on h 0 (E) where E is a semistable bundle of rank 3 over a smooth irreducible projective curve X of genus g â‰¥ 2 defined over an algebraically closed field ofâ€¦ (More)

Let C be a nonsingular irreducible projective curve of genus g â‰¥ 2 defined over the complex numbers. Suppose that 1 â‰¤ n â€² â‰¤ n âˆ’ 1 and n â€² d âˆ’ nd â€² = n â€² (n âˆ’ n â€²)(g âˆ’ 1). It is known that, for theâ€¦ (More)

Let p : C Ï€ âˆ’â†’ C g âˆ’â†’ Y be a covering of smooth, projective curves with deg(Ï€) = 2 and deg(g) = n. Let f : X â†’ Y be the covering of degree 2, where the curve X parametrizes the liftings in C(n) ofâ€¦ (More)

where the maximum is taken over all line subbundles L of E, is just the minimum of the self intersection numbers of all sections of the ruled surface P(E) â†’ C. Note that E is stable (respectivelyâ€¦ (More)

Let Hg and B2g+2 denote the moduli spaces of stable hyperelliptic curves of genus g and semistable binary forms of degree 2g + 2 respectively. These are certainly different compactifications of Hg =â€¦ (More)

Let X be a smooth projective curve of genus g â‰¥ 2 over an algebraically closed field k of characteristic p > 0. Let M X be the moduli space of semistable rank-2 vector bundles over X with trivialâ€¦ (More)

An abelian variety admits only a finite number of isomorphism classes of principal polarizations. The paper gives an interpretation of this number in terms of class numbers of definite Hermitianâ€¦ (More)