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Regular version of the site

Working paper

Degenerations of spherical subalgebras and spherical roots

arxiv.org. math. Cornell University, 2019. No. 1905.01169.
We obtain several structure results for a class of spherical subgroups of connected reductive complex algebraic groups that extends the class of strongly solvable spherical subgroups. Based on these results, we construct certain one-parameter degenerations of the Lie algebras corresponding to such subgroups. As an application, we exhibit an explicit algorithm for computing the set of spherical roots of such a spherical subgroup.