The Weyl extension algebra of GL₂(Fp)

Vanessa Miemietz, Will Turner

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8 Citations (Scopus)


We compute the Yoneda extension algebra of the collection of Weyl modules for GL2 over an algebraically closed field of characteristic p>0 by developing a theory of generalised Koszul duality for certain 2-functors, one of which controls the rational representation theory of GL2 over such a field.
Original languageEnglish
Pages (from-to)144-197
Number of pages54
JournalAdvances in Mathematics
Publication statusPublished - 20 Oct 2013


  • Extension algebra
  • Weyl modules
  • GL2
  • Dg algebras

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