Mathematical Research Letters
Volume 25 (2018)
Divisibilities among nodal curves
Pages: 1359 – 1368
We prove that there are no effective or anti-effective classes of square $-1$ or $-2$ arising from nodal curves on smooth algebraic surfaces by way of divisibility. This general fact has interesting applications to Enriques and K3 surfaces. The proof relies on specific properties of root lattices and their duals.
Received 14 August 2017