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arXiv · 2603.03518

Rank and Independence of Imaginaries in Proper Pairs of ACF

Zixuan Zhu
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Abstract

Let $T_P$ be the theory of beautiful pairs of algebraically closed fields of fixed characteristic. It is known that for real tuples in models of $T_P$, SU-rank coincides with Morley rank and can be computed effectively. Building on Pillay's geometric description (2007) of imaginaries in $T_P$, we define an additive rank on imaginaries of $T_P$, called the geometric rank. It takes values in $\omega*\mathbb N + \mathbb Z$ and coincides with SU-rank on real tuples. It refines SU-rank and characterizes forking in $T_P^{\mathrm{eq}}$, from which we derive an explicit criterion for determining forking independence.

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Zixuan Zhu. 2026-03-03. Rank and Independence of Imaginaries in Proper Pairs of ACF. https://arxiv.org/abs/2603.03518

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