### Possible Answer

Cantor's definition turned out to be inadequate for formal mathematics; instead, the notion of a "set" is taken as an undefined primitive in axiomatic set theory, and ... - read more

Equivalent sets. Cantorian set theory is founded on the principles of extension and abstraction, described above. To describe some results based upon these principles ... - read more

Please vote if the answer you were given helped you or not, thats the best way to improve our algorithm. You can also submit an answer or search documents about what is equal sets in maths.