Infinite loop space machine

In topology, a branch of mathematics, given a topological monoid X up to homotopy (in a nice way), 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, $X=BS$ . Then the machine produces the group completion $BS\to K(S)$ . The space $K(S)$ may be described by the K-theory spectrum of S.

References

May, The uniqueness of infinite loop space machine

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