What is set notation and how do I use it?

What is set notation and how do I use it?

Set notation is a mathematical way to describe a collection of objects, called a set. It uses symbols like { } to enclose the elements.

Can you give me an example of a set?

Sure! An example of a set is {1, 2, 3, 4}, which contains the numbers 1 through 4.

What do the symbols ∈ and ∉ mean?

The symbol ∈ means 'is an element of', while ∉ means 'is not an element of'. For example, 2 ∈ {1, 2, 3} is true, but 5 ∉ {1, 2, 3} is also true.

How do I represent the union of two sets?

The union of two sets A and B is represented as A ∪ B, which includes all elements from both sets without duplicates.