Abstract:
Let F be a field of characteristic ≠2 and φ be a quadratic form over F. By X φ we denote the projective variety given by the equation φ=0. For each positive even integer d≥8 (except for d=12) we construct a field F and a pair φ, ψ of anisotropic d-dimensional forms over F such that the Chow motives of X φ and X ψ coincide but . For a pair of anisotropic (2n -1)-dimensional quadrics X and Y, we prove that existence of a rational morphism Y→X is equivalent to existence of a rational morphism Y→X.
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Received: 27 September 1999 / Revised version: 27 December 1999
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Izhboldin, O. Motivic equivalence of quadratic forms. II. manuscripta math. 102, 41–52 (2000). https://doi.org/10.1007/s002291020041
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DOI: https://doi.org/10.1007/s002291020041