A model theoretic proof for o-minimal coherence theorem

Yayi Fu

Published 2023-10-27Version 1

Bakker, Brunebarbe, Tsimerman showed in \cite{bakker2022minimal} that the definable structure sheaf $\mathcal{O}_{\mathbb{C}^n}$ of $\mathbb{C}^n$ is a coherent $\mathcal{O}_{\mathbb{C}^n}$-module as a sheaf on the site $\underline{\mathbb{C}^n}$, where the coverings are finite coverings by definable open sets. In general, let $\mathbb{K}$ be an algebraically closed field of characteristic zero. We give a more model-theoretic proof of the coherence of $\mathcal{O}_{\mathbb{K}^n}$ as a sheaf of $\mathcal{O}_{\mathbb{K}^n}$-module on the site $\underline{\mathbb{K}^n}$ using spectral topology on the type space $S_n(\mathbb{K})$.