# Numbers Index

Numbers are the building blocks of mathematics. A number represents a quantity expressed using symbols.

## Notation

Eulers Number | Notation

Euler's Number is represented in mathematics with the letter e and has some unique exponential properties.

Pi | Notation

The greek letter pi is a number in mathematics that describes the ratio a circle's circumference divided by its diamater.

Tau | Notation

The symbol tau is used in mathematics to represent the ratio of the circumeference of the circle divided by its radius.

2D Space | Notation

Two dimensional space is denoted using the symbol for the set of real numbers followed by a superscript two.

3D Space | Notation

Three dimensional space is denoted using the symbol for the set of real numbers followed by a superscript three.

Complex Number | Notation

A complex number is represented in two parts. The first is the real number part and the second is the imaginary number part.

Decimal Point | Notation

The decimal point is used to separate the whole part of a number from the decimal part. The whole part is represented using number digits to the left of the decimal point. The decimal part is also represented using digits to the right of the decimal point.

Imaginary Number | Notation

The letter i is used in mathematics to represent the square root of negative one.

Scientific Notation | Notation

Scientific notation is a notation that scientists use to keep track of the number of significant digits in a number as well as easily recognize the magnitude of a number.

Set of Complex Numbers | Notation

The set of complex numbers is denoted using the Latin capital letter C most often presented with a double-struck typeface.

Set of Integers | Notation

Set of Natural Numbers | Notation

Set of Rational Numbers | Notation

Set of Real Numbers | Notation

## Concepts

Counting | Concept

Counting is the process of calculating the quantity of a group of objects.

Constant | Concept

A mathematical constant is a significant value that mathematecians have assigned a symbol representation.

Constants | Concept

Mathematical constants are symbols that represent useful numbers.

Prime Numbers | Concept

A prime number is a number that is only divisible by itself and one. The set of prime numbers is infinitely big. The first prime numbers are 2, 3, 5, 7, 11, ... and continues on forever.

Set of Complex Numbers | Concept

The set of complex numbers contains all possible complex numbers. Each complex number has a real part and an complex part.

Set of Integers | Concept

The set of integers is made up of the set of counting integers and each of their negative counter parts.

Set of Natural Numbers | Concept

The set of natural numbers, also called the counting numbers, contains the numbers 0, 1, 2, 3, ...

Set of Rational Numbers | Concept

The set of rational numbers can be defined by the quotient of two numbers belonging to the set of integers, where the divisor is non-zero.

Set of Real Numbers | Concept

The set of real numbers contains the set of rational numbers as well as irrational numbers like pi, e, and the square root of two.