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Log geometry and lifting rational points

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arxiv 2509.12167 v2 pith:6N6VWB5I submitted 2025-09-15 math.AG math.NT

classification math.AGmath.NT
keywords criterionpointsringabramovichdedekinddiscretedomaineven
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abstract

For a morphism $f : X \to Y$ of schemes, we give a tropical criterion for which points of $Y$ (valued in a field, discrete valuation ring, number ring, or Dedekind domain) lift to $X$. Our criterion extends the firmaments of Abramovich to a wide range of morphisms, even logarithmic stable maps.

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