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$K_2$-regularity and normality

Christian Haesemeyer and Charles A. Weibel

Vol. 11 (2026), No. 3, 543–553
Abstract

We take a fresh look at the relationship between K-regularity and regularity of schemes, proving two results in this direction. First, we show that K2-regular affine algebras over fields of characteristic zero are normal. Second, we improve on Vorst’s K-regularity bound in the case of local complete intersections; this is related to recent work on higher du Bois singularities.

Keywords
algebraic $K\mkern-2mu$-theory, cyclic homology, du Bois complex, algebraic surfaces
Mathematical Subject Classification
Primary: 19D35
Secondary: 14F20, 19E20
Milestones
Received: 17 March 2025
Revised: 28 March 2026
Accepted: 29 April 2026
Published: 5 September 2026
Authors
Christian Haesemeyer
School of Mathematics and Statistics
University of Melbourne
Parkville, VIC
Australia
Charles A. Weibel
Department of Mathematics
Rutgers University
New Brunswick, NJ
United States