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math.AG2019
Computing singularities of the spectra of representation rings of finite groups
André Gimenez Bueno, Renato Vidal Martins, Edney Oliveira +1
Let be a finite group of order , and an -th primitive root of unity. Consider the affine scheme $C:=\mbox{Spc}({\mathbb Z}[ξ]\otimes_{\mathbb Z} R(G))$ where i…
math.RA2019
The isomorphism problem for universal enveloping algebras of four-dimensional solvable Lie algebras
José L. Vilca Rodríguez, Csaba Schneider, Hamid Usefi
This paper is a contribution to the isomorphism problem for universal enveloping algebras of finite-dimensional Lie algebras. We focus on solvable Lie algebras of small dimensions…
math.GR2019
Transitive characteristically simple subgroups of finite quasiprimitive permutation groups
Pedro H. P. Daldegan, Csaba Schneider
The first main result of this paper is that a finite transitive nonabelian characteristically simple subgroup of a wreath product in product action must lie in the base group of th…