Integral points on affine quadric surfaces
Abstract
It is well-known that the Hasse principle holds for quadric hypersurfaces. The Hasse principle fails for integral points on smooth quadric hypersurfaces of dimension 2 but the failure can be completely explained by the Brauer-Manin obstruction. We investigate how often the family of quadric hypersurfaces ax2 + by2 +cz2 = n has a Brauer-Manin obstruction. We improve previous bounds of Mitankin.
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