Commutators in SL2\mathrm{SL}_2 and Markoff surfaces I

preprint2022arXivOpen access

Abstract

We show that the commutator equation over SL2(Z)\mathrm{SL}_2(\mathbb{Z}) satisfies a profinite local to global principle, while it can fail with infinitely many exceptions for SL2(Z[1p]) \mathrm{SL}_2(\mathbb{Z}[\frac{1}{p}]). The source of the failure is a reciprocity obstruction to the Hasse Principle for cubic Markoff surfaces.

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