Algebraic cycles, sheaves, shtukas, and moduli by Piotr Pragacz

By Piotr Pragacz

The articles during this quantity are committed to:

- moduli of coherent sheaves;

- imperative bundles and sheaves and their moduli;

- new insights into Geometric Invariant Theory;

- stacks of shtukas and their compactifications;

- algebraic cycles vs. commutative algebra;

- Thom polynomials of singularities;

- 0 schemes of sections of vector bundles.

The major objective is to provide "friendly" introductions to the above issues via a sequence of entire texts ranging from a truly effortless point and finishing with a dialogue of present examine. In those texts, the reader will locate classical effects and strategies in addition to new ones. The publication is addressed to researchers and graduate scholars in algebraic geometry, algebraic topology and singularity thought. lots of the fabric provided within the quantity has now not seemed in books before.

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Extra info for Algebraic cycles, sheaves, shtukas, and moduli

Sample text

Its Chern classes are denoted ci (E) ∈ H 2i (X; C). We define the degree of E deg E = c1 (E)H n−1 and its Hilbert polynomial PE (m) = χ(E(m)), where E(m) = E ⊗ OX (m) and OX (m) = OX (1)⊗m . r If E is locally free, we define the determinant line bundle as det E = E. If E is torsion free, since X is smooth, we can still define its determinant as follows. The maximal open subset U ⊂ X where E is locally free is big (with this we will mean that its complement has codimension at least two), because it is torsion free.

Lectures given in the Mini-School on Moduli Spaces at the Banach center (Warsaw) 26–30 April 2005. In these notes we will always work with schemes over the field of complex numbers C. Let X be a scheme. A vector bundle of rank r on X is a scheme with a surjective morphism p : V → X and an equivalence class of linear atlases. A linear atlas is an open cover {Ui } of X (in the Zariski topology) and isomorphisms ψi : p−1 (Ui ) → Ui × Cr , such that p = pX ◦ ψi , and ψj ◦ ψi−1 is linear on the fibers.

Limits of instantons. Intern. Journ. of Math. 3 (1992), 213–276. , Spindler, H. Vector bundles on complex projective spaces. Progress in Math. 3, Birkh¨ auser (1980). [18] Ramanan, S. The moduli spaces of vector bundles over an algebraic curve. Math. Ann. 200 (1973), 69–84. T. Moduli of representations of the fundamental group of a smooth projective variety I. Publ. Math. IHES 79 (1994), 47–129. -M. , Trautmann, G. Deformations of coherent analytic sheaves with compact supports. Memoirs of the Amer.

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