#### Vol. 2, No. 1, 2017

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$\mathbb A^1$-homotopy invariance of algebraic $K$-theory with coefficients and du Val singularities

Vol. 2 (2017), No. 1, 1–25
DOI: 10.2140/akt.2017.2.1
##### Abstract

C. Weibel, and Thomason and Trobaugh, proved (under some assumptions) that algebraic $K\phantom{\rule{0.3em}{0ex}}$-theory with coefficients is ${\mathbb{A}}^{1}$-homotopy invariant. We generalize this result from schemes to the broad setting of dg categories. Along the way, we extend the Bass–Quillen fundamental theorem as well as Stienstra’s foundational work on module structures over the big Witt ring to the setting of dg categories. Among other cases, the above ${\mathbb{A}}^{1}$-homotopy invariance result can now be applied to sheaves of (not necessarily commutative) dg algebras over stacks. As an application, we compute the algebraic $K\phantom{\rule{0.3em}{0ex}}$-theory with coefficients of dg cluster categories using solely the kernel and cokernel of the Coxeter matrix. This leads to a complete computation of the algebraic $K\phantom{\rule{0.3em}{0ex}}$-theory with coefficients of the du Val singularities parametrized by the simply laced Dynkin diagrams. As a byproduct, we obtain vanishing and divisibility properties of algebraic $K\phantom{\rule{0.3em}{0ex}}$-theory (without coefficients).

##### Keywords
$\mathbb{A}^1$-homotopy, algebraic $K$-theory, Witt vectors, sheaf of dg algebras, dg orbit category, cluster category, du Val singularities, noncommutative algebraic geometry
##### Mathematical Subject Classification 2010
Primary: 14A22, 14H20, 19E08, 30F50, 13F35
##### Milestones
Received: 10 March 2015
Revised: 20 October 2015
Accepted: 4 November 2015
Published: 3 September 2016
##### Authors
 Gonçalo Tabuada Department of Mathematics Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge, MA 02139 United States Centro de Matemática e Aplicações Departamento de Matemática Faculdade de Ciências e Tecnologia Universidade Nova de Lisboa Portugal