Hi, I’m Justus

I like maths and code

About me

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I’m a Research Associate in Formalization of Mathematics at Imperial College London. Previously, I was a PhD student of Jürgen Hausen in Tübingen, doing algebraic geometry.

  • Formalizing maths with Lean
  • Varieties with torus action
  • Del Pezzo surfaces
  • Convex geometry, polygons
  • Writing programs that count stuff

Publications

Generalizations of Scott's inequality and Pick's formula to rational polygons

With Martin Bohnert

Preprint

Classifying Rational Polygons with Small Denominator and Few Interior Lattice Points

With Martin Bohnert

Discrete & Computational Geometry (2026)

Classifying log del Pezzo surfaces with torus action

With Daniel Hättig, and Jürgen Hausen

Revista Matemática Complutense 39, 1–74 (2026)

Del Pezzo surfaces of Picard number one admitting a torus action

With Daniel Hättig, Beatrice Hafner, and Jürgen Hausen

Annali di Matematica Pura ed Applicata 204, 1899–1936 (2025)

The Picard index of a surface with torus action

Collectanea Mathematica 76, 515–544 (2025)

Classification and Geometry of Rational Polygons and Surfaces with Torus Action

PhD thesis, University of Tübingen (2025)



Contact

Room 758, Huxley Building, South Kensington Campus, United Kingdom

My current local time is .

j.springer@imperial.ac.uk