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math.CO2025
The characteristic quasi-polynomials of hyperplane arrangements with actions of finite groups
Ryo Uchiumi
In this paper, we introduce an equivariant version of the characteristic quasi-polynomials as the permutation characters on the complement of mod hyperplane arrangements. We pr…
math.CO2025
Exponents of 2-multiarrangements of three lines over fields of positive characteristic
Shuhei Tsujie, Ryo Uchiumi
Wakamiko determined bases and the exponents for multiarrangements of three lines over a field of characteristic zero. In this paper, we study the exponents of multiarrangements of…