## Does the power set contain the empty set?

In mathematics, the power set (or powerset) of a set S is the set of all subsets of S, including the empty set and S itself.

In axiomatic set theory (as developed, for example, in the ZFC axioms), the existence of the power set of any set is postulated by the axiom of power set..

## What does a intersection B mean?

In mathematics, the intersection of two sets A and B, denoted by A ∩ B, is the set containing all elements of A that also belong to B (or equivalently, all elements of B that also belong to A).

## What are the types of sets?

Types of a SetFinite Set. A set which contains a definite number of elements is called a finite set. … Infinite Set. A set which contains infinite number of elements is called an infinite set. … Subset. … Proper Subset. … Universal Set. … Empty Set or Null Set. … Singleton Set or Unit Set. … Equal Set.More items…•

## What is a ∆ B?

A∆B which is called the symmetric difference between A and B is defined as (A-B)U(B-A). Now, A-B is the set of all elements which are in A but not in B. So, A – B = {1,2}. Similarly, B-A is the set of all elements which are in B but not in A.

## What is a symmetric difference b?

The symmetric difference of set A with respect to set B is the set of elements which are in either of the sets A and B, but not in their intersection. This is denoted as A△B or A⊖B or. \text{A}{\oplus}{B}.

## What is the power set of a set?

In set theory, the power set (or powerset) of a Set A is defined as the set of all subsets of the Set A including the Set itself and the null or empty set. It is denoted by P(A). Basically, this set is the combination of all subsets including null set, of a given set.

## What is the power set of ABCD?

Power set of {a,b,c} & {a,b,c,d} I know that the power set includes the empty set as well and that a power set has 2n elements in the set. Therefore 23=8 elements in the set.