Number

One Number (of old-high-German zala: nicked mark) is in .

In that a number is by a certain Indication or a combination of indication representable abstract term, with its assistance mathematical linkages to be formed can. Those Number writing sits down from single symbols, to the in such a way specified Numbers, together.

A number is used, around one Quantity to express, for example 5 or 12 €, whereby one this quantity as that Worth the number, Numerical value or Yardstick designated (here 5 and 12) and the basis for a compromise of this quantity as Unit (here m² and €), see also physical dimension.

One calls the words, with which the abstract number terms are designated, Number words (for example four).

Number sets

• Natural numbers
  • • Wieferich prime number
    • Illegal prime number
    • Sophie Germain prime number
    • Mersenne prime number
    • Fermat prime number
    • Wilson prime number
    • Wolstenholme prime number
    • Prime number twins
  • Compound number
    • Triangle number
    • Zeisel number
    • Pseudo prime number
      • Fermat pseudo prime number
      • Euler pseudo prime number
      • strong pseudo prime number
      • Carmichael number
  • Perfect number
  • Got used to number
  • Abundante number
  • Defiziente number
  • Smooth number
  • Cyclic number
  • Pandigitale number
  • Straight numbers
  • Odd numbers
• Whole numbers
• Rational numbers
  • pwhole numbers
• Real numbers
  • Positive and negative numbers
  • Normal number
  • Calculable numbers
• Complex numbers
  • Imaginary numbers
• Quaternions
• Oktaven
• Cardinal numbers
• Ordinal numbers
• Hyper+real numbers
• Surreale numbers

Resuming information

Articles with the characteristics of numbers, their spreading, history, way of writing and handling them are concerned:

• Arithmetic (the "number counting")
• Chinese numbers
• Dyskalkulie (computing weakness)
• Googol (a name for the number of <math>10^{100}</math>)
• Greek numbers
• Indian numbers
• Years
• Japanese numbers
• List of special numbers
• Liquor number
• Way of writing of numbers
• Numbers in different languages
• Number name
• Number symbolism
• Number system
• count
• Counting

Literature

• Ebbinghaus et. aluminium.: Numbers. Berlin: Springer, 1992, ISBN 3-54055-654-0
• Ifrah, Georges: Universal history of the numbers. Frankfurt, New York: Campus, 1991, ISBN 3-88059-956-4