Download Algebraic cycles and Hodge theory: lectures given at the 2nd by Mark L. Green, Jacob P. Murre, Claire Voisin, Alberto PDF

By Mark L. Green, Jacob P. Murre, Claire Voisin, Alberto Albano, Fabio Bardelli

The most aim of the CIME summer season tuition on "Algebraic Cycles and Hodge idea" has been to collect the main energetic mathematicians during this quarter to make the purpose at the current cutting-edge. therefore the papers incorporated within the complaints are surveys and notes at the most crucial issues of this region of analysis. They contain infinitesimal equipment in Hodge concept; algebraic cycles and algebraic points of cohomology and k-theory, transcendental tools within the research of algebraic cycles.

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Extra info for Algebraic cycles and Hodge theory: lectures given at the 2nd session of the Centro internazionale matematico estivo

Example text

In the literature there are several special classes of graphs codifying special families of 3-manifolds, for which the graph calculus, that is the set of allowed operations, is more restrictive. Such special classes are for example, “spherical plumbing graphs”, “orientable plumbing graphs with no cycles”, or “star-shaped plumbing graphs”. g. 2 in [94]. Besides the study of special families of 3-manifolds, there is another motivation to consider reduced sets of operations. If the class of plumbing graphs considered is the result of a special geometric construction, then they might carry some information in their shape or decorations which might be lost in the diffeomorphism type of M.

P; Z/ associated with the basis fŒCw gw2W . 8. The multiplicity system associated with an open book decomposition. 3. K is called a fibered link if it is the binding of an open book decomposition of M . The case of a fibered link K in a 3-manifold M has a special interest in purely topological discussions too. Links provided by singularity theory are usually fibered. M; K/ has a plumbed representation provided by a plumbing graph (decorated with Euler numbers and genera) and arrows (representing K).

In particular, A is non-degenerate, hence the multiplicities fmw gw2W can be recovered from the Euler numbers and the multiplicities fma ga2A , cf. 6. 5). This “naive” property has a rather important technical advantage: a multiplicity can always be determined by a local computation, on the other hand the Euler number is a global characteristic class. This principle will be used frequently in the present book. X / are connected as follows from Zariski’s Main Theorem, see [57] or [45]. 5. Examples.

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