Search for a tool
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.

Results

Number Sets -

Tag(s) : Mathematics

dCode and you

dCode is free and its tools are a valuable help in games, puzzles and problems to solve every day!
You have a problem, an idea for a project, a specific need and dCode can not (yet) help you? You need custom development? Contact-me!

Team dCode read all messages and answer them if you leave an email (not published). It is thanks to you that dCode has the best Number Sets tool. Thank you.

This page is using the new English version of dCode, please make comments !

# 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.

## Answers to Questions

### 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.

## Source code

dCode retains ownership of the source code of the script Number Sets. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, etc.) which dCode owns rights can be transferred after sales quote. So if you need to download the Number Sets script for offline use, for you, your company or association, see you on contact page !

## Questions / Comments

Team dCode read all messages and answer them if you leave an email (not published). It is thanks to you that dCode has the best Number Sets tool. Thank you.

Source : http://www.dcode.fr/number-sets
© 2017 dCode — The ultimate 'toolkit' to solve every games / riddles / geocaches. dCode