Sets Intersection: Intersection Of Two Sets



In this lesson, we will learn how to use Venn Diagrams to illustrate the intersection of two sets.

Related Topics:
More lessons on sets


The intersection of two sets X and Y is the set of elements that are common to both set X and set Y. It is denoted by XY and is read ‘X intersection Y’.


Example:

Draw a Venn diagram to represent the relationship between the sets

X = {1, 2, 5, 6, 7, 9, 10} and Y = {1, 3, 4, 5, 6, 8, 10}

Solution:

We find that XY = {1, 5, 6, 10} ← in both X and Y

For the Venn diagram,

Step 1 : Draw two overlapping circles to represent the two sets.

Step 2 : Write down the elements in the intersection.

Step 3 : Write down the remaining elements in the respective sets.

Notice that you start filling the Venn diagram from the elements in the intersection first.





If X Y then XY = X . We will illustrate this relationship in the following example.


Example:

Draw a Venn diagram to represent the relationship between the sets

X = {1, 6, 9} and Y = {1, 3, 5, 6, 8, 9}

Solution:

We find that XY = {1, 6, 9} which is equal to the set X

For the Venn diagram,

Step 1 : Draw one circle within another circle

Step 2 : Write down the elements in the inner circle.

Step 3 : Write down the remaining elements in the outer circle.



Videos

Venn diagrams are an important tool allowing relations between sets to be visualized graphically. This video introduces the use of Venn diagrams to visualize intersections and unions of sets, as well as subsets and supersets.



Venn Diagrams, Unions, and Intersections
Venn diagrams are an important tool allowing relations between sets to be visualized graphically. This chapter introduces the use of Venn diagrams to visualize intersections and unions of sets, as well as subsets and supersets.





Intersection of Sets



The following video describes the Union and Intersection of Sets





Sets: Union, Intersection, Complement



Sets: Union and Intersection.
The basic idea of the 'union' and 'intersection' of two sets.







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