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math.RA2026
Coactions of cocommutative Hopf algebras on skew polynomial rings
Lucas Buzaglo, Daniel Rogalski
We classify the cocommutative Hopf algebras which coact inner-faithfully on (one-parameter) skew polynomial rings $A_q(n) = \Bbbk \langle x_1,\dots,x_n \rangle/(x_j x_i - q x_i x_j…
math.RA2024
Closed subcategories of quotient categories
Daniel Rogalski
We study the spectrum of closed subcategories in a quasi-scheme, i.e. a Grothendieck category . The closed subcategories are the direct analogs of closed subschemes in the commu…