2 papers
math.AG2026
Open surfaces with a triangle at infinity
Dmitriy Chunaev, Alexander Perepechko, Daniil Shunin
A triangle surface is an open algebraic surface completed by a triangle of contractible -curves. We establish a combinatorial description of their completions. We also show t…
math.RT2025
Orbits of spherical representations and Pyasetskii duality
Daniil Shunin
Dual representations and of a complex connected algebraic group simultaneously have either infinitely or finitely many orbits. Whenever the latter holds, the orbits i…