1 citations · 1 across the 3 of their papers we have counts for
3 papers
math.AG2023
The Picard index of a surface with torus action
Justus Springer
We consider normal rational projective surfaces with torus action and provide a formula for their Picard index, that means the index of the Picard group inside the divisor class gr…
math.AG2023★ 1 cited
Classifying log del Pezzo surfaces with torus action
Daniel Haettig, Juergen Hausen, Justus Springer
We consider log del Pezzo surfaces coming with a non-trivial torus action. Such a surface is 1/k-log canonical if it allows a resolution of singularities with discrepanies all grea…
math.AG2022
Del Pezzo surfaces of Picard number one admitting a torus action
Daniel Haettig, Beatrice Hafner, Juergen Hausen +1
We present efficient classification algorithms for log del Pezzo surfaces with torus action of Picard number one and given Gorenstein index. Explicit results are obtained up to Gor…