Question

what is set theory?

Answer 1

the branch of mathematics which deals with the formal properties of sets as units (without regard to the nature of their individual constituents) and the expression of other branches of mathematics in terms of sets.

Answer 2

Answer:

a branch of mathematics which deals with formal properties.

definition of set

set is the collection of well defined element or a collection of similar things. it is denoted capital letter that is A,B,C

and small letters a,b,c, it's a trial taken as elements are members to form a set.

example A={a,b,c}

here

a belongs to A

but d doesn't belong to A

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