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Global actions, K-theory and unimodular rows

Global actions were introduced by Bak in order to have a homotopy theory in a purely algebraic setting. In this paper we apply his techniques in a particular case: the (single domain) unimodular row global action. More precisely, we compute the the path connected component and fundamental group for the unimodular row global action. An explicit computation of the fundamental group of the (connected component of) unimodular row global action is closely related to stability questions in K-theory. This will be shown by constructing an exact sequence with the fundamental group functor as the middle term and having surjective stability for the functor K_2 on the left and injective stability for the functor K_1 on the right.

preprint2013arXivOpen access
Anthony BakAnuradha S. Garge
math.KT
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Anthony BakAnuradha S. Garge

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