Sets and its types — lesson. Mathematics State Board, Class 9.

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Let us recall the definition of sets.

A set is a collection of the well-defined object.

Set notation: A set is denoted by capital letters English alphabets

$A, B, C, D,...$

Elements: Elements of the sets are denoted by small letters English alphabets

$a, b, c,...$

Also, the elements of the set should be written inside the curly brackets

$\{\}$ .

Types of sets.

There are many types of sets in set theory. They are:

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1. Sets and its types