📚 Recommended Mathematics Books

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

As an Amazon associate, I earn from qualifying purchases.

I’ve defined (well, vaguely defined) what I call “meta-singular numbers”. These can be used to describe values of a function in a singularity.

See this PlanetMath article.