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maojun1998

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[×ÊÔ´] GTM257,Deformation Theory,Robin Hartshorne

Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1 First-Order Deformations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1. The Hilbert Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Structures over the Dual Numbers . . . . . . . . . . . . . . . . . . . . . . . . . 9
3. The Ti Functors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4. The Infinitesimal Lifting Property . . . . . . . . . . . . . . . . . . . . . . . . . 26
5. Deformations of Rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2 Higher-Order Deformations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6. Subschemes and Invertible Sheaves . . . . . . . . . . . . . . . . . . . . . . . . 45
7. Vector Bundles and Coherent Sheaves . . . . . . . . . . . . . . . . . . . . . . 53
8. Cohen¨CMacaulay in Codimension Two . . . . . . . . . . . . . . . . . . . . . 58
9. Complete Intersections and Gorenstein in Codimension Three . 73
10. Obstructions to Deformations of Schemes . . . . . . . . . . . . . . . . . . . 78
11. Obstruction Theory for a Local Ring . . . . . . . . . . . . . . . . . . . . . . . 85
12. Dimensions of Families of Space Curves . . . . . . . . . . . . . . . . . . . . 88
13. A Nonreduced Component of the Hilbert Scheme . . . . . . . . . . . . 91
3 Formal Moduli . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
14. Plane Curve Singularities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
15. Functors of Artin Rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
16. Schlessinger¡¯s Criterion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
17. Hilb and Pic are Pro-representable . . . . . . . . . . . . . . . . . . . . . . . . . 118
18. Miniversal and Universal Deformations of Schemes . . . . . . . . . . . 120
19. Versal Families of Sheaves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
20. Comparison of Embedded and Abstract Deformations . . . . . . . . 131
21. Algebraization of Formal Moduli . . . . . . . . . . . . . . . . . . . . . . . . . . 138
22. Lifting from Characteristic p to Characteristic 0 . . . . . . . . . . . . . 144
vi Contents
4 Global Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
23. Introduction to Moduli Questions . . . . . . . . . . . . . . . . . . . . . . . . . 150
24. Some Representable Functors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
25. Curves of Genus Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
26. Moduli of Elliptic Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
27. Moduli of Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
28. Moduli of Vector Bundles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
29. Smoothing Singularities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
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