Blar i ODA Open Digital Archive på forfatter "Christophersen, Jan Arthur"

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    • Comparison theorems for deformation functors via invariant theory 

      Christophersen, Jan Arthur; Kleppe, Jan Oddvar (Collectanea Mathematica;January 2019, Volume 70, Issue 1, Journal article; Peer reviewed, 2018-09-06)
      We compare deformations of algebras to deformations of schemes in the setting of invariant theory. Our results generalize comparison theorems of Schlessinger and the second author for projective schemes. We consider ...