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Number Sets

Tool to understand sets of numbers N, Z, Q, R, I, C. Number sets are groups of numbers constructed by mathematicians in order to define them and classify them.

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Tag(s) : Mathematics

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# Number Sets

## Number sets calculator

Tool to understand sets of numbers N, Z, Q, R, I, C. Number sets are groups of numbers constructed by mathematicians in order to define them and classify them.

### What are common number sets?

In mathematics, there are multiple sets: the natural numbers N, the set of integers Z, all decimal numbers D, the set of rational numbers Q, the set of real numbers R and the set of complex numbers C.

### What is the number set N?

N is the set of natural numbers

Example: 0, 1, 2, 3, 4, 5, ... 10, 11, ..., 100, ...

N* is the set of natural numbers except 0 (zero)

### What is the number set Z?

Z is the set of integers, ie. positive, negative or zero.

Example: ..., -100, ..., -12, -11, -10, ..., -5, -4, -3, -2, - 1, 0, 1, 2, 3, 4, 5, ... 10, 11, 12, ..., 100, ...

The set N is included in the set Z

Z* is the set of integers except 0 (zero).

### What is the number set D?

D is the set of decimal numbers, i.e. represented by a x 10^n, where a and n are elements of Z.

All decimals in D are numbers that can be written with a finite number of digits.

Example: -123.45, -2.1, -1, 0, 5, 6.7, 8.987654

The sets N and Z are included in the set D.

### What is the number set Q?

Q is the set of rational numbers, ie. represented by a fraction a/b with a belonging to Z and b belonging to Z * (cannot divide by 0).

Example: 1/3, -4/1, 17/34, 1/123456789

Sets N, Z and D are included in the set Q.

### What is the number set R?

R is the set of real numbers, ie. all numbers that can actually exist, it contains in addition to rational numbers, non-rational numbers or irrational as $$\pi$$ or $$\sqrt{2}$$.

Example: $$\Pi$$ $$\sqrt{2}$$ $$\sqrt{3}$$, ...

Sets N, Z, D and Q are included in the set R.

### What is the number set I?

I is the set of imaginary numbers, ie. the numbers that can not actually exist, these numbers have been created by mathematicians to solve certain equations.

Example: i, i^2=-1

### What is the number set C?

C is the set of complex numbers, ie. the set of real numbers R and all imaginary numbers I.

Example: A + ib

Sets N, Z, D, Q, R and I are included in the set C.

### What are inclusions of sets?

$$N \subset Z \subset D \subset Q \subset R \subset C$$

### Why the letter Q for Rationals?

Q was chosen for the word Quotient.