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In topology, a branch of mathematics, given a topological monoid X up to homotopy , an infinite loop space machine produces a group completion of X together with infinite loop space structure. For example, one can take X to be the classifying space of a symmetric monoidal category S; that is, X = B S {\displaystyle X=BS}. Then the machine produces the group completion B S → K {\displaystyle BS\to K}. The space K {\displaystyle K} may be described by the K-theory spectrum of S.
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