Notation

Symbols

• $\mathbb{R}$ - Set of all real numbers
• $\mathbb{Z}$ - Set of integers
• $ϵ$ - is an element of set. E.g. $xϵ\mathbb{Z}$ means x is an element of integer set
• $\mathbb{N}$ - Set of natural numbers (Any integers starting from 1)

Intervals

When writing

Square brackets = Include
Circle brackets = Exclude

Example

1. $[0,10)=0\le x<10$

For graphs

Function