Resumen de The reductive Borel–Serre compactification as a model for unstable algebraic K-theory

Dustin Clausen, Mikala Ørsnes Jansen

• Let A be an associative ring and M a finitely generated projective A-module. We introduce a category RBS(M) and prove several theorems which show that its geometric realisation functions as a well-behaved unstable algebraic K-theory space. These categories RBS(M) naturally arise as generalisations of the exit path ∞-category of the reductive Borel–Serre compactification of a locally symmetric space, and one of our main techniques is to find purely categorical analogues of some familiar structures in these compactifications