Glossary

Common Math Symbols

Math symbol	Definition
=	Equal to
$\neq$ $\neq$	Not equal to
$\approx$ $\approx$	Approximately equal to
>	Greater than
<	Less than
$\geq$ $\geq$	Greater than or equal to
$\leq$ $\leq$	Less than or equal to
+	Plus (addition)
−	Minus (subtraction)
$\times$ $\times$ , ·, ∗	Time or multiply by (multiplication)
$\div$ $\div$ , /	Divide by or over (quotient)
:	Ratio or proportion
$\to$ $\to$	Implies
$\leftrightarrow$ $\leftrightarrow$	If and only if
( )	Parenthesis
[ ]	Bracket
{ }	Braces, indicate set membership
$\emptyset$ $\emptyset$	Empty set
$π$ $π$	Pi, (3.14…)
e	Exponent, (2.72…)
log	Logarithm
\| \|	Absolute value
$\sqrt{}$ $\sqrt{}$	Square root
\|	Such that

Set of natural number is

ℕ = {1,2,3, ...} .

$ℕ = {1,2,3, ...} .$

Set of integer numbers is

ℤ = {..., - 3, - 2, - 1,0,1,2,3, ...} .

$ℤ = {..., - 3, - 2, - 1,0,1,2,3, ...} .$

Set of rational numbers is

ℚ = \frac{m}{n}

$ℚ = \frac{m}{n}$

;

m, n \in ℤ

$m, n \in ℤ$

with

n \neq 0

$n \neq 0$

Note:

\sqrt{2}, \sqrt{3}, \sqrt[3]{7}, a n d π \notin ℚ

$\sqrt{2}, \sqrt{3}, \sqrt[3]{7}, a n d π \notin ℚ$

ℝ

$ℝ$

is set of all numbers

ℚ

$ℚ$

and not rational with their negative and zeros.

ℂ

$ℂ$

is set of the complex Numbers written in form

a + b i

$a + b i$

, where

a, b \in ℝ

$a, b \in ℝ$

The Greek Alphabet