The Set of Natural Numbers (the Positive Integers Z+ 1, 2, 3, ...; Sloane's A000027), denoted , also called the Whole Numbers. Like whole numbers, there is no general agreement on whether 0 should be included in the list of natural numbers.

Due to lack of standard terminology, the following terms are recommended in preference to ``Counting Number,'' ``natural number,'' and ``Whole Number.''

Set | Name | Symbol |

..., , , 0, 1, 2, ... | integers | Z |

1, 2, 3, 4, ... | positive integers | Z+ |

0, 1, 2, 3, 4 ... | nonnegative integers | Z* |

, , , , ... | negative integers | Z- |

**References**

Sloane, N. J. A. Sequence
A000027/M0472
in ``An On-Line Version of the Encyclopedia of Integer Sequences.''
http://www.research.att.com/~njas/sequences/eisonline.html and Sloane, N. J. A. and Plouffe, S.
*The Encyclopedia of Integer Sequences.* San Diego: Academic Press, 1995.

© 1996-9

1999-05-25