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On the construction and the realization of wild monoids

Pavel Růžička (2018)

Archivum Mathematicum

We develop elementary methods of computing the monoid 𝒱 ( R ) for a directly-finite regular ring R . We construct a class of directly finite non-cancellative refinement monoids and realize them by regular algebras over an arbitrary field.

On the K -theory and Hattori-Stallings traces of minimal primitive factors of enveloping algebras of semisimple Lie algebras : the singular case

Patrick Polo (1995)

Annales de l'institut Fourier

Let G be a semisimple complex algebraic group and X its flag variety. Let 𝔤 = Lie ( G ) and let U be its enveloping algebra. Let 𝔥 be a Cartan subalgebra of 𝔤 . For μ 𝔥 * , let J μ be the corresponding minimal primitive ideal, let U μ = U / J μ , and let 𝒯 U μ : K 0 ( U m u ) be the Hattori-Stallings trace. Results of Hodges suggest to study this map as a step towards a classification, up to isomorphism or Morita equivalence, of the -algebras U μ . When μ is regular, Hodges has shown that K 0 ( U μ ) K 0 ( X ) . In this case K 0 ( U μ ) is generated by the classes corresponding to...

On the K-theory of tubular algebras

Dirk Kussin (2000)

Colloquium Mathematicae

Let Λ be a tubular algebra over an arbitrary base field. We study the Grothendieck group K 0 ( Λ ) , endowed with the Euler form, and its automorphism group A u t ( K 0 ( Λ ) ) on a purely K-theoretical level as in [7]. Our results serve as tools for classifying the separating tubular families of tubular algebras as in the example [5] and for determining the automorphism group A u t ( D b Λ ) of the derived category of Λ.

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