ALGEBRAS DETERMINED BY THEIR SUPPORTS

Ibrahim Assem (1) , Diane Castonguay (2) , Marcelo Lanzilotta (3) , Rossana Vargas (4)

1 UdeS - Département de mathématiques [Sherbrooke]
2 UFRGS - Instituto de Informática da UFRGS
3 IMERL - Instituto de Matemática y Estadística Rafael Laguardia [Montevideo]
4 EACH - Escola de Artes Ciências e Humanidades

In this paper, we introduce and study a class of algebras which we call ada algebras. An artin algebra is ada if every indecomposable projective and every indecomposable injective module lies in the union of the left and the right parts of the module category. We describe the Auslander-Reiten components of an ada algebra, showing in particular that its representation theory is entirely contained in that of its left and right supports, which are both tilted algebras. Also, we prove that an ada algebra over an algebraically closed field is simply connected if and only if its first Hochschild cohomology group vanishes.

Mots clés: Representation theory; Module category; artin algebras

Domaines: Théorie des représentations [math.RT]

Ibrahim Assem, Diane Castonguay, Marcelo Lanzilotta, Rossana Vargas. ALGEBRAS DETERMINED BY THEIR SUPPORTS. 2011. ⟨hal-00563485⟩