In general topology, a branch of mathematics, the Appert topology, named for {harvtxt|Appert|1934}, is an example of a topology on the set 1=Z+ = {1, 2, 3, …} of positive integers. To give Z+ a topology means to say which subsets of Z+ are open in a manner that satisfies certain axioms: In the Appert topology, the open sets are those that d...

Found on http://en.wikipedia.org/wiki/Appert_topology

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