N

The Set of Natural Numbers (the Positive IntegersA000027), 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,'' ``naturalnumber,'' 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. SequenceA000027/M0472in ``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.

• Pigeonhole Principle
• Pi Heptomino
• Pillai's Conjecture
• Pilot Vector
• Pinching Theorem
• Pinch Point
• Pine Cone Number
• Piriform
• Pisot-Vijayaraghavan Constants
• Pistol
• Pitchfork Bifurcation
• Pivoting
• Pivot Theorem
• Pizza Theorem
• Place (Digit)
• Place (Field)
• Place (Game)
• Planar Bubble Problem
• Planar Distance
• Planar Graph
• Planar Point
• Planar Space
• Planar Straight Line Graph
• Plancherel's Theorem
• Planck's Radiation Function