arXiv:2610.40815v1 Announce Type: new Abstract: We study the integral Hasse principle for the affine surfaces given by $x^4+y^4-w^2=m^2$, where $m>1$ is odd and squarefree. We give a criterion to determine if there is an integral Brauer--Manin obstruction, which depends only on simple congruence conditions on the prime factors of $m$ modulo $8$. We use this to show that for $100\%$ of such surfaces there is no integral Brauer--Manin obstruction to the Hasse principle for integral points.
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