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Learn about the first natural number, its properties, and its uses in mathematics, computer science, and education. Find out how to write and pronounce one in different languages and numeral systems.
- one
- 1st, (first)
- 1
- unary
1 ( one) is a number, numeral, and the glyph that represents the number. It represents a single entity and is commonly regarded as the fundamental unit of counting and measurement. For example, a line segment of "unit length" is a line segment of length 1. In mathematics, the number 1 is the natural number [1] that follows 0 and precedes 2.
Learn about the imaginary unit 'i' and how it relates to complex numbers. Watch a video that explains the concept of square roots of negative numbers and the difference between principal and non-principal roots.
- 7 min
- Sal Khan
One half is a rational number that lies midway between nil and unity (which are the elementary additive and multiplicative identities) as the quotient of the first two non-zero integers, . It has two different decimal representations in base ten, the familiar and the recurring , with a similar pair of expansions in any even base; while in odd ...
