Justus Springer

Publications

• 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 (2025)
• Classifying log del Pezzo surfaces with torus action. With Daniel Hättig and Jürgen Hausen. Revista Matemática Complutense (2025).
• The Picard index of a surface with torus action. Collectanea Mathematica (2024).

Preprints

• Generalizations of Scott's inequality and Pick's formula to rational polygons. With Martin Bohnert.
• Classifying rational polygons with small denominator and few interior lattice points. With Martin Bohnert.

Software and data

My software projects can be found on my Github page. These include:

• CStarSurfaces.jl: A Julia package for computations with rational C*-surfaces.
• RationalPolygons.jl: A Julia package for computations with rational polygons.

I also maintain ldp-database, which is a searchable web interface for log del pezzo surfaces admitting a non-trivial torus action.

Some of my projects come with additional datasets. You can find them on zenodo.

Contact information