The set of all nonnegative integers is usually called the set of nonnegative integers (or natural number set). Non-negative integer sets include natural numbers such as 0, 1, 2 and 3. Mathematically, the letter "n" represents a group of non-negative integers. Non-negative integer sets include positive integers and zeros. A set of nonnegative integers is a countable set.

"n+" or "n *" is a set of all positive integers.

Mark "*" in the upper right corner of "n" or "+"in the lower right corner of "n" to indicate a group of numbers that are not included in zero and negative numbers.

Extended data:

The meaning of "n" in other fields:

In spoken English, "n" usually means many things, such as "I bought a lot of phone cards" and "I only met him once and know him well".

Chemically, it refers to the chemical symbol, particle number and equivalent concentration of elemental nitrogen (abbreviation of equivalent concentration). In organic chemistry, it also means that methyl groups are attached to nitrogen atoms, such as N- methyl propionamide, with molecular formula: CH3CH2CONHCH3.

"n" stands for the zero line in AC current.

"n" is on the map, due north.

In physics, the unit of force is Newton, or simply Newton, which is represented by the symbol n.

Interpretation of other representatives of Baidu Encyclopedia -N

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