Re: Han's startling new set theory.

david petry wrote:

Certainly group theory and algebraic topology have uses in physics,
and anything that is useful in physics must make testable predictions.

Point set topology is another story. 

Yeah. I have still to see a sensible application of PST ...

BTW. Can someone come up with an _overview_ of everything that carries
the name "topology"? With a short explanation what the differences are.
It seems to me that there are many of the kind. What is their genealogy?

Please?

Han de Bruijn

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