Erratum to the Fourier–Mukai partners paper

A new erratum to A note on Fourier–Mukai partners of abelian varieties over positive characteristic fields is now posted on the publications page. The converse implication in Proposition 4.5 of that paper is false — Ogus’s Torelli theorem gives a bijection on isomorphism classes, which does not realize a prescribed crystalline isometry — and the erratum gives a counterexample over \(\overline{\mathbb{F}}_5\): supersingular abelian surfaces \(A \not\cong B\) related by a degree-2 isogeny, with isomorphic abelian crystals but inequivalent derived categories. The surface theorem, Theorem 4.6, does not use the erroneous converse and stands unchanged. This note replaces the earlier addendum, whose strong-approximation argument is withdrawn.