Scully's generalized separation conjecture for quadratic forms
Scully's generalized separation conjecture for quadratic forms
Let be an arbitrary field, let and be anisotropic quadratic forms over of dimensions at least , and let be the unique integer such that
Let be the function field of the integral affine quadric defined by , let be the isotropy index of over , and set
Scully's conjecture. If is isotropic, then
for some positive integer and integer such that . This conjecturally strengthens the separation theorem by constraining the dimension of a form that becomes isotropic over the function field of another quadric. The stated result has since been proved: Hoffmann established it in characteristic different from , and Hoffmann and Laghribi extended it to characteristic .
Sources & referencesView supporting material
Primary source
Stephen Scully, “Extended Karpenko and Karpenko-Merkurjev theorems for quasilinear quadratic forms”, arXiv:2409.02059 (2024).
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