A simplicial approach to effective divisors in M¯0,n
A simplicial approach to effective divisors in M¯0,n
We study the Cox ring and monoid of effective divisor classes of M¯0,n≅Blℙn−3, over a ring R. We provide a bijection between elements of the Cox ring, not divisible by any exceptional divisor section, and pure-dimensional singular simplicial complexes on {1,…,n−1} with weights in R∖{0} satisfying a zero-tension condition. This …