Fredholm theory for cofinite sets

27 Sep 2015  ·  Robinson P. L. ·

We investigate two ways in which self-maps of an infinite set may be close to bijections; our investigation generates a $\mathbb{Z}$-valued index theory and a corresponding extension by $\mathbb{Z}$ for the quotient of the full symmetric group by its finitary subgroup...

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Group Theory Combinatorics