First, the author includes zero in the

**set of natural numbers**.This definition appears very frequently and is found in the following Acronym Finder categories:

- Science, medicine, engineering, etc.

See other **definitions of N**

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- November
- Nucleoprotein (virus protein)
- Nullipara
- Number
- Number of Years
- Numeric
- Occupation Regular Issues (Scott Catalogue prefix; philately)
- Principal Quantum Number (used in formulae in quantum physics)
- Refractivity
- Sensitive Unclassified (information)

- Southwest Ontario (postal code designation, Canada)
- True Neutral (gaming)
- Unable to Locate Complainant (Alabama Public Safety Radio Code)
- US DoT tire speed rating (87 mph)
- España Llaganya
- Nautical Miles
- Neural Inspiratory and Expiratory
- Name and Address
- Natural and Artificial (flavor)
- Nishimura & Asahi (law firm; Japan)

First, the author includes zero in the **set of natural numbers**.

One can obtain all k-power free number by the following method: From the **set of natural numbers** (except 0 and 1).

Example : Let R be the **set of Natural Numbers** including zero and [empty set] : R [right arrow] [0,1] be a fuzzy subset defined by [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII.

HN UN = N, where HN, the set of Happy Numbers, and UN, the set of Unhappy Numbers, and N, the **set of Natural numbers**.