Set theory is difficult for some people, because it is approached much differently than most other areas of mathematics. Where we are used to taking a great deal of intuitive assertions for granted, such as arithmetic, or even having numbers to work with, in set theory, this is abandoned in favor of trying to build everything from the very bottom up, by beginning with only the most essential propositions about collections of objects. It's essentially the most abstract of the major fields, and the least friendly to outsiders.
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Discoverer of a particular mathematical concept is hard to say as a certain concept is accepted or emerged after many researches.But for set theory as far as we know there is only a single discoverer named Georg Cantor.
Classical theory is a reference to established theory. Fuzzy set theory is a reference to theories that are not widely accepted.
Set theory was founded by Georg Cantor in 1873.
Who: Basically, the set theory was developed by Georg Cantor.
prove the intersction for crisp set theory