Spin canonical rings of log stacky curves
arXiv:1507.02643 · doi:10.5802/aif.3065
Abstract
Consider modular forms arising from a finite-area quotient of the upper-half plane by a Fuchsian group. By the classical results of Kodaira-Spencer, this ring of modular forms may be viewed as the log spin canonical ring of a stacky curve. In this paper, we tightly bound the degrees of minimal generators and relations of log spin canonical rings. As a consequence, we obtain a tight bound on the degrees of minimal generators and relations for rings of modular forms of arbitrary integral weight.
arXiv comment36 pages. To appear in the Annales de l'Insitut Fourier