5 citations · 5 across the 2 of their papers we have counts for
5 papers
Polyhedral Divisors and Algebraic Torus Actions
Klaus Altmann, Juergen Hausen
We provide a complete description of normal affine varieties with effective algebraic torus action in terms of what we call proper polyhedral divisors on semiprojective varieties.…
The Graph of Monomial Ideals
Klaus Altmann, Bernd Sturmfels
There is a natural infinite graph whose vertices are the monomial ideals in a polynomial ring. The definition involves Gröbner bases or the action of an algebraic torus. We present…
The chain property for the associated primes of A-graded ideals
Klaus Altmann
We investigate how the chain property for the associated primes of monomial degenerations of toric (or lattice) ideals can be generalized to arbitrary A-graded ideals. The generali…
The polyhedral Hodge number h^21 and vanishing of obstructions
Klaus Altmann, Duco van Straten
We prove a vanishing theorem for the Hodge number h^21 of projective toric varieties provided by a certain class of polytopes. We explain how this Hodge number also gives informati…
Estimating Vaccine Coverage by Using Computer Algebra
D. Altmann, K. Altmann
The approach of N. Gay for estimating the coverage of a multivalent vaccine from antibody prevalence data in certain age cohorts is improved by using computer aided elimination the…