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Beware the Phony Multiplication on Quillen's $\mathscr{a}^{-1}\mathscr{a}$

R. W. Thomason
Proceedings of the American Mathematical Society
Vol. 80, No. 4 (Dec., 1980), pp. 569-573
DOI: 10.2307/2043425
Stable URL: http://www.jstor.org/stable/2043425
Page Count: 5
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Beware the Phony Multiplication on Quillen's $\mathscr{a}^{-1}\mathscr{a}$
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Abstract

This paper exposes a subtle but irreparable flaw in a frequently proposed construction of the graded ring structure on the algebraic $K$-groups of commutative rings.

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