SET AND TYPES OF SET

 

SET AND TYPES OF SETS


SET: A set s well defined collection of objects or numbers or elements.

UNION OF SET: The union of two sets is a set containing all elements that are in A or in B.

INTERSECTION OF SET: Intersection of two given sets is the largest set which contains all the elements that are common to both the sets.


TYPES OF SETS

1. Empty Sets
The set, which has no elements, is also called a null set or void set. It is denoted by {}.Below are the two examples of the empty set.
Example of empty set: Let set A = {a: a is the number of students studying in Class 6th and Class 7th}. As we all know, a student cannot learn in two classes, therefore set A is an empty set.
Another example of an empty set is  set B = {a: 1 < a < 2, a is a natural number}, we know a natural number cannot be a decimal, therefore set B is a null set or empty set.
2. Singleton Sets
The set which has just one element is named a singleton set.
For example,Set A = { 8 } is a singleton set.
3. Finite and Infinite Sets
A set that has a finite number of elements is known as a finite set, whereas the set whose elements can't be estimated, but has some figure or number, which is large to precise in a set, is known as infinite set.
For example, set A = {3,4,5,6,7} is a finite set, as it has a finite number of elements.Set C = {number of cows in India} is an infinite set, there is an approximate number of cows in India, but the actual number of cows cannot be expressed, as the numbers could be very large and counting all cows is not possible.
4. Equal SetsIf 
every element of set A is also the elements of set B and if every element of set B is also the elements of set A, then sets A and B are called equal sets. It means set A and set B have equivalent elements and that we can denote it as:A = B
For example, let A = {3,4,5,6} and B = {6,5,4,3}, then A = BAnd if A = {set of even numbers} and B = { set of natural numbers} then A ≠ B, because natural numbers consist of all the positive integers starting from 1, 2, 3, 4, 5 to infinity, but even numbers start with 2, 4, 6, 8, and so on.
5. Subsets
A set S is said to be a subset of set T if the elements of set S belong to set T, or you can say each element of set S is present in set T. 
Subset of a set is denoted by the symbol (⊂) and written as S ⊂ T.
We can also write the subset notation as:S ⊂ T if p ∊ S ⇒ p ∊ T
According to the equation given above, “S is a subset of T only if ‘p’ is an element of S as well as an element of T.” Each set is a subset of its own set, and a void set or empty set is a subset of all sets.
6. Power Sets
The set of all subsets is known as power sets. We know the empty set is a subset of all sets, and each set is a subset of itself. 
Taking an example of set X = {2,3}. From the above-given statements, we can write,{} is a subset of {2,3}{2} is a subset of {2,3}{3} is a subset of {2,3}{2,3} is also a subset of {2,3}Therefore, power set of X = {2,3},P(X) = {{},{2},{3},{2,3}}
7. Universal Sets
A set that contains all the elements of other sets is called a universal set. Generally, it is represented as ‘U.’
For example, set A = {1,2,3}, set B = {3,4,5,6}, and C = {5,6,7,8,9}.Then, we will write the universal set as, U = {1,2,3,4,5,6,7,8,9,}.
Note: According to the definition of the universal set, we can say that all the sets are subsets of the universal set. Therefore,A ⊂ UB ⊂ UAnd C ⊂ U
8. Disjoint Sets
If two sets X and Y do not have any common elements, and their intersection results in zero(0), then set X and Y are called disjoint sets. It can be represented as;, X ∩ Y = 0.Union, Intersection, Difference, and Complement of Sets
1. Union of Sets
The union of two sets consists of all their elements. It is denoted by (⋃).For example, set A = {2,3,7} and set B = { 4,5,8}.Then the union of set A and set B will be: A ⋃ B = {2,3,7,4,5,8}(Image will be Uploaded Soon)
2. Intersection of Sets
The set of all elements, which are common to all the given sets, gives an intersection of sets. It is denoted by ⋂.For example, set A = {2,3,7} and set B = {2,4,9}.So, A ⋂ B = {2}(Image will be Uploaded Soon)
3. Difference of Sets
The difference between set S and set T is such that it has only those elements which are in the set S and not in the set T. S – T = {p : p ∊ S and p ∉ T}Similarly, T – S = {p: p ∊ T and p ∉ S}.
4. Complement of a Set
Let U be the universal set and let A ⊂ U. Then, the complement of A, denoted by A’ or (U - A), is defined as A’ = {x   U : x A}X A’ x A
Every set has a complement of sets. Also, for a universal set, the empty set is known as the complement of the universal set. The empty set contains no elements of the subset and is also known as null set, which is denoted by {Ø} or {}.

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