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math.RA2015
The commutators of classical groups
R. Hazrat, N. Vavilov, Z. Zhang
In his seminal paper, half a century ago, Hyman Bass established a commutator formula in the setting of (stable) general linear group which was the key step in defining the K_1 gro…
math.KT2015
Triangular objects and systematic K-theory
Thomas Huettemann, Zuhong Zhang
We investigate modules over "systematic" rings. Such rings are "almost graded" and have appeared under various names in the literature; they are special cases of the G-systems of G…