Table of Contents

## Proper Subset

### What is Proper Subset?

A set A is called a **Proper Subset** of B only when

- Set
*A*and set*B*are not equal and - Set
*A*is a subset of set*B.*

### Proper Subset Symbol

If set A is a **Proper Subset **of set B, then mathematically, it can be written as,

A\subset B

### Proper Subset Example

Let us consider two sets A and B as given below.

A = {1, 2, 3}

B = {1, 2, 3, 4, 5}

The figure shows the Venn diagram of a **Proper Subset**. Here, Set A is called the **Proper Subset **of set B because all the elements of set A are present in the set B, and set A and B are not equal.

Therefore,

\displaystyle A\subset B.

## Frequently Asked Questions (FAQ)

### What is Proper subset and Improper subset?

A set A is called proper subset of set B when all the elements of A are present in set B and set A and B are not equal. However, set A is called improper subset of set B when set A and B are equal sets.

### Can a set be a subset and proper subset?

Yes, a set can be a subset and a proper subset at the same time. To be a proper subset, both sets should not be equal.

### Is null set a Proper subset?

For a set to be a proper subset of any set A, the set must have at least one element of set A. But, a null set does not have any element. Therefore, a null set is not a proper subset.

### Is Phi a proper subset?

The set phi is called an empty set. An empty set is a proper subset of any set. Therefore, Phi is a proper subset.

### What is the difference between Improper subset and Equal set?

There is no difference between Improper subset and Equal set. This is because, for a set to be an Improper subset of any set all the elements of both the sets should be equal.

### What is the number of improper subset of a set?

There is only one improper subset of a set because, for a set to be a improper subset of any set, both the sets must be equal.

### Is Phi a proper subset or Improper subset?

The set phi is called an empty set. An empty set is a proper subset of any set. Phi is not a improper subset.

### What is the sign of Improper subset?

The sign of improper subset is the same as a subset and is denoted by $⊂.$

### What is the improper subset of a, b, c, d?

The Improper subset of of set A={a, b, c, d} is the set itself i.e., {a, b, c, d}.

### Is an empty set an improper subset?

An empty set Phi is always a proper subset. Therefore, empty set Phi is not a improper subset of any set. However, an empty set can be an improper subset of itself.

### What is improper subset?

A set $A$ is called **Improper Subset **of $B$ only when all the elements of set $A$ and $B$ are equal. **Improper Subsets** can simply be called **Subsets**. If a set is an **Improper Subset** of another set, then both sets are equal.

### What is Proper Subset?

A set $A$ is called a **Proper Subset** of $B$ only when

Set *A* and set *B* are not equal and

Set *A* is a subset of set *B.*

### How do you find the proper subset?

- Let A={1, 2, 3, 4} and B={1, 2}. Find out if B is a proper subset of A.
- Check whether all the elements of B are present in A. The elements of B are 1 and 2. Both are present in A.
- Check whether A and B are equal. The sets A and B are not equal as elements 3 and 4 are not present in the set B.
- If both the conditions in step 2 and 3 are satisfied then B is a proper subset of A. Both the conditions are satisfied. Therefore, B is a proper subset of A.

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