On the 3-Pfister Number of Quadratic Forms |
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Authors: | Mélanie Raczek |
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Institution: | 1. FNRS, ICTEAM Institute , Université catholique de Louvain , Louvain-la-Neuve , Belgium melanie.raczek@uclouvain.be |
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Abstract: | For a field F of characteristic different from 2, containing a square root of -1, endowed with an F×2-compatible valuation v such that the residue field has at most two square classes, we use a combinatorial analogue of the Witt ring of F to prove that an anisotropic quadratic form over F with even dimension d, trivial discriminant, and Hasse–Witt invariant can be written in the Witt ring as the sum of at most (d2)/8 3-fold Pfister forms. |
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Keywords: | Algebraic theory of quadratic forms Witt groups and rings |
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