📚 Recommended Mathematics Books

Topology (Munkres)  |  General Topology (Engelking)  |  Counterexamples in Topology  |  Rudin's Analysis

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In this short note I describe four sets (including the set of filters itself) which bijectively correspond to the set of filters on a poset.

I raise the question: How to denote all these four posets and their principal elements? Please write to my email any ideas about this.