Partially Ordered
Joseph Sullivan

Hello, I’m Joseph.

I’m a fourth-year math PhD candidate at the University of Utah. I like algebraic geometry and derived categories. When not doing math, you can catch me on a trail run, baking breads and sweet treats, or playing music poorly.

Partially Ordered is my math blog and programming portfolio.

Featured posts

April 2026

Brauer Group

An introduction to Brauer groups, first for a field (i.e., Spec k for a geometer) and then for a scheme.

AlgebraAlgebraic Geometry
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April 2025

Beilinson's Resolution of the Diagonal

An explanation of Beilinson's famous 'Problems in Linear Algebra', in particular showing how his paper gives a full strong exceptional collection and a derived equivalence to quiver representations.

Algebraic GeometryCategory Theory
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Featured projects

Simultanio preview

Simultanio

A real-time strategy game made with Python, Flask, JavaScript, and Socket.io.