Seminář z algebry - 18.4.2019 PDF Tisk

Další seminář z algebry se koná 18.4.2019 od 13.00 v posluchárně M5.

L. Positselski

Agreeable and topologically agreeable abelian categoreies

In the category of modules over an associative ring, there is a notion of a summable family of morphisms between a given pair of objects. The sum of such an (infinite) family of morphisms is well-defined.
In fact, there is a natural topology on the group of morphisms between two modules, and the summable families are simply the families of morphisms converging to zero in this topology. Generalizing to additive categories, one comes to the definition of an agreeable additive category, which was suggested in a 1973 unpublished manuscript of A.L.S. Corner, and to a more narrow class of topologically agreeable categories.
All Grothendieck abelian categories are agreeable, and all nearly finitely presentable Grothendieck categories are topologically agreeable; but nondiscrete spectral Grothendieck abelian categories are not topologically agreeable.

Aktualizováno Pondělí, 15 Duben 2019 11:02