The Natural Numbers, $\Bbb{N},$ are the positive integers. Some people include zero, and some people don't. Some people put a decoration on the symbol to indicate that zero definitely is, or definitely is not included.

There is no consensus, so care must be taken.

See also Counting Numbers and Whole Numbers.

MixedNumber
MultiplyingWholeNumbers
PerfectNumber
PrimeNumber
RootTwoIsIrrational
SquareNumber
SubtractingWholeNumbers
Surd
TranscendentalNumber
TypesOfNumber
UncountableSet Banach-TarskiParadox
BirthdayProblem
CantorSet
PascalsTriangle
Permutation
RationalNumber
TransfiniteNumbers
ZeroFactorial
CountingNumber
WholeNumber
ContinuumHypothesis
CountableSet
Factorial
GeorgCantor
MathematicsTaxonomy

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NaturalNumber
Integer
(none) (none) RealNumber

# Local neighbourhood - D3

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