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Study of Quadratic Forms — Some Connections with Geometry

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Proceedings of the International Congress of Mathematicians

Abstract

Let X be an algebraic variety over a field k of characteristic not 2. A quadratic space on X is a locally free sheaf ε on X together with a self-dual isomorphism q : ε → εv. In this article we outline some recent developments concerning the stable and nonstable study of quadratic spaces over algebraic varieties. Although this study borrows tools from algebra and geometry, it yields in return new insights into certain seemingly unrelated questions in algebra and geometry.

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References

  1. S.A. Amitsur, L.H. Rowen, and J.P. Tignol, Division algebras of degrees 4 and 8 with involution, Israel J. Math. 33 (1979), 133–148.

    Article  MathSciNet  Google Scholar 

  2. J.Kr. Arason, Der Wittring projektiver Raurrce, Math. Ann. 253 (1980), 205–212.

    Article  MathSciNet  Google Scholar 

  3. J.Kr. Arason, R. Elman, and B. Jacob, The graded Witt ring and Galois cohomology, Can. Math. Soc. Conf. Proc. 4 (1984), 17–50.

    MathSciNet  MATH  Google Scholar 

  4. J.Kr. Arason, R. Elman, and B. Jacob, On generators for the Witt ring, Contemp. Math. 155 (1994), 247–269.

    Article  MathSciNet  Google Scholar 

  5. G. Ayoub, Le groupe de Witt d’une surface réelle, Comm. Math. Helv. 62 (1987), 74–105.

    Article  MathSciNet  Google Scholar 

  6. J. Barge, and M. Ojanguren, Sur le troisième invariant d’une forme quadratique, preprint 1994.

    Google Scholar 

  7. W. Barth, and K. Hulek, Monads and moduli of vector bundles, Manuscripta Math. 25 (1978), 323–347.

    Article  MathSciNet  Google Scholar 

  8. E. Bayer-Fluckiger, and R. Parimala, Galois cohomology of the classical groups over fields of cohomological dimension < 2, to appear in Invent. Math.

    Google Scholar 

  9. S. Bloch, A. Ogus, Gersten’s conjecture and the homology of schemes, Ann. Sci. Ecole Norm. Sup., 4e série 7 (1974), 181–202.

    Article  MathSciNet  Google Scholar 

  10. J.-L. Colliot-Thelene, Cycles algébriques de torsion et K-theorie algebrique, Arithmetic Algebraic Geometry, Trento 1991, 1–49, SLN 1553.

    Google Scholar 

  11. J.-L. Colliot-Thelene, and R. Parimala, Real components of algebraic varieties and étale cohomology, Invent. Math. 101 (1990), 81–99.

    Article  MathSciNet  Google Scholar 

  12. J.-L. Colliot-Thélène, and C. Scheiderer, Zero cycles and cohomology of real algebraic varieties, preprint 1994.

    Google Scholar 

  13. J.-L. Colliot-Thelene, and R. Sujatha, Unramified Witt groups of real aniso-tropic quadrics, Proc. Symp. Pure Math. 58, Part II (1995), 127–147.

    MATH  Google Scholar 

  14. C.H. Giffen, Hasse-Witt invariants for (ca, u) reflexive forms and automorphisms I: Algebraic K2-valued Hasse-Witt invariants, J. Algebra 44 (1977), 434–456.

    Article  MathSciNet  Google Scholar 

  15. N. Jacobson, Clifford algebras for algebras with involution of type D, J. Algebra 1 (1964), 288–300.

    Article  MathSciNet  Google Scholar 

  16. M. Knebusch, On algebraic curves over real closed fields II, Math. Z. 151 (1976), 189–205.

    Article  MathSciNet  Google Scholar 

  17. M. Knebusch, Some open problems, in: Conference on Quadratic Forms, Queen’s Papers in Pure and Appl. Math. 46 (1977), Kingston, Ontario, 361–370.

    MathSciNet  MATH  Google Scholar 

  18. M.-A. Knus, M. Ojanguren, and R. Sridharan, Quadratic forms and Azumaya algebras, J. Reine Angew. Math. 303/304 (1978), 231–248.

    MathSciNet  MATH  Google Scholar 

  19. M.-A. Knus, R. Parimala, and R. Sridharan, Non-free projective modules over ℍ[X, Y] and stable bundles over P2(C), Invent. Math. 65 (1981), 13–27.

    Article  MathSciNet  Google Scholar 

  20. M.-A. Knus, R. Parimala, and R. Sridharan, A classification of rank 6 quadratic spaces via Pfaffians, J. Reine Angew. Math. 398 (1989), 187–218.

    MathSciNet  MATH  Google Scholar 

  21. M.-A. Knus, R. Parimala, and R. Sridharan, Pfaffians, central simple algebras and similitudes, Math. Z. 206 (1991), 589–604.

    Article  MathSciNet  Google Scholar 

  22. M.-A. Knus, R. Parimala, and R. Sridharan, Compositions and triality, J. Reine. Angew. Math. 457 (1994), 45–70.

    MathSciNet  MATH  Google Scholar 

  23. V.I. Kopeiko, and A.A. Suslin, Quadratic modules over polynomial rings, J. Soy. Math. 17 (1981), 2024–2031.

    Article  Google Scholar 

  24. S. Lichtenbaum, Duality theorems for curves over p-adic fields, Invent. Math. 7 (1969), 120–136.

    Article  MathSciNet  Google Scholar 

  25. L. Mahe, Signatures et composantes connexes, Math. Ann. 260 (1982), 191–210.

    Article  MathSciNet  Google Scholar 

  26. J. Milnor, Algebraic K-theory and quadratic forms, Invent. Math. 9 (1970), 318–344.

    Article  MathSciNet  Google Scholar 

  27. M. Ojanguren, Formes quadratiques sur les algebres de polynômes, C. R. Acad. Sci. Paris, Sér. A 287 (1978), 695–698.

    MathSciNet  MATH  Google Scholar 

  28. M. Ojanguren, R. Parimala, and R. Sridharan, Indecomposable quadratic bundles of rank 4n over the real affine plane, Invent. Math. 71 (1983), 648–653.

    Article  MathSciNet  Google Scholar 

  29. M. Ojanguren, R. Parimala, and R. Sridharan, Anisotropic quadratic spaces over the plane, in: Vector bundles on algebraic varieties, Bombay 1984, OUP 1987, 465–489.

    Google Scholar 

  30. M. Ojanguren, R. Parimala, and R. Sridharan, Ketu and the second invariant of a quadratic space, K-theory 7 (1993), 501–515.

    Article  MathSciNet  Google Scholar 

  31. M. Ojanguren, and R. Sridharan, Cancellation of Azumaya algebras, J. Algebra 18 (1971), 501–505.

    Article  MathSciNet  Google Scholar 

  32. R. Parimala, Failure of a quadratic analogue of Serre’s conjecture, Amer. J. Math. 100 (1978), 913–924.

    Article  MathSciNet  Google Scholar 

  33. R. Parimala, Indecomposable quadratic spaces over the affine plane, Adv. in Math. 62 (1986), 1–6.

    Article  MathSciNet  Google Scholar 

  34. R. Parimala, Witt groups of conics, elliptic and hyperelliptic curves, J. Number Theory 28 (1988), 69–93.

    Article  MathSciNet  Google Scholar 

  35. R. Parimala, Witt groups of affine 3-folds, Duke Math. J. 57 (1989), 947–954.

    Article  MathSciNet  Google Scholar 

  36. R. Parimala, Witt groups vis-a,-vis Chow groups, in: Geometry, Bombay 1990, NBHM (1993), 149–154.

    Google Scholar 

  37. R. Parimala, and W. Scharlau, On the canonical class of a curve and extension property for quadratic forms, Contemp. Math. 155 (1994), 339–350.

    Article  MathSciNet  Google Scholar 

  38. R. Parimala, and R. Sridharan, Projective modules over polynomial rings over division rings, J. Math. Kyoto Univ. 15 (1975), 129–148.

    Article  MathSciNet  Google Scholar 

  39. R. Parimala, and R. Sridharan, Graded Witt rings and unramified cohomology, K-Theory 6 (1992), 29–44.

    Article  MathSciNet  Google Scholar 

  40. R. Parimala, and R. Sridharan, Reduced norms and Pfaffians via BrauerSeveri schemes, Contemp. Math. 155 (1994), 351–363.

    Article  Google Scholar 

  41. R. Parimala, R. Sridharan, and V. Suresh, A question on the discriminants of involutions of central division algebras, Math. Ann. 297 (1993), 575–580.

    Article  MathSciNet  Google Scholar 

  42. R. Parimala, and V. Srinivas, Analogues of the Brauer group for algebras with involution, Duke Math. J. 66 (1992), 207–237.

    Article  MathSciNet  Google Scholar 

  43. R. Parimala, and R. Sujatha, Witt group of hyperelliptic curves, Comm. Math. Helv. 65 (1990), 559–580.

    Article  MathSciNet  Google Scholar 

  44. R. Parimala, and V. Suresh, Zero cycles on quadric fibrations: finiteness theorems and the cycle map, to appear in Invent. Math.

    Google Scholar 

  45. M.S. Raghunathan, Principal bundles on affine space and bundles on the projective line, Math. Ann. 285 (1989), 309–332.

    Article  MathSciNet  Google Scholar 

  46. S. Saito, A conjecture of Bloch and Brauer groups of surfaces over p-adic fields, preprint 1990.

    Google Scholar 

  47. S. Saito, and R. Sujatha, Finiteness theorems for cohomology of surfaces over p-adic fields and an application to Witt groups, Proc. Symp. Pure Math. 58, Part II (1995), 403–415.

    Article  MathSciNet  Google Scholar 

  48. J. Shick, Witt groups of function fields of hyperelliptic curves, Comm. Algebra 21 (4) (1993), 1371–1388.

    Article  MathSciNet  Google Scholar 

  49. R. Sujatha, Witt groups of real projective surfaces, Math. Ann. 288 (1990), 89–101.

    Article  MathSciNet  Google Scholar 

  50. A.A. Suslin, Algebraic K-theory and the norm residue homomorphism, J. Soviet Math. 30 (1985), 2556–2611.

    Article  Google Scholar 

  51. J. Tits, Formes quadratiques, groupes orthogonaux et algebres de Clifford, Invent. Math. 5 (1968), 19–41.

    Article  MathSciNet  Google Scholar 

  52. E. Witt, Zerlegung reeller algebraischer Funktionen in Quadrate, Schiefkörper über reellem Funktionenkörper, J. Reine Angew. Math. 171 (1934), 4–11.

    MathSciNet  MATH  Google Scholar 

  53. V.I. Yanchevskii, Symmetric and skew-symmetric elements of involutions, associated groups and the problem of decomposability of involutions, Proc. Symp. Pure Math. 58, Part II (1995), 431–444.

    MathSciNet  MATH  Google Scholar 

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© 1995 Birkhäser Verlag, Basel, Switzerland

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Parimala, R. (1995). Study of Quadratic Forms — Some Connections with Geometry. In: Chatterji, S.D. (eds) Proceedings of the International Congress of Mathematicians. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-9078-6_26

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  • DOI: https://doi.org/10.1007/978-3-0348-9078-6_26

  • Publisher Name: Birkhäuser, Basel

  • Print ISBN: 978-3-0348-9897-3

  • Online ISBN: 978-3-0348-9078-6

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