Question

what is set theory ​

Answer 1

Answer:

set is basic and unifying idea of mathematics. in fact all mathematical ideas can be expressed in terms of sets. In almost whole of the business mathematics, the set theory is applied in one form or the other

Answer 2

Set theory is the mathematical theory of well-determined collections, called sets, of objects that are called members, or elements, of the set. ... In set theory, however, as is usual in mathematics, sets are given axiomatically, so their existence and basic properties are postulated by the appropriate formal axioms.