1
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1 (one) is a number, numeral, and the name of the glyph representing that number. It represents a single entity. One is sometimes referred to as unity or unit as an adjective. For example, a line segment of "unit length" is a line segment of length 1.
In mathematics, it may represent:
For any number x:
Using ordinary addition, we have 1 + 1 = 2.
One cannot be used as the base of a positional numeral system; sometimes tallying is referred to as "base 1", since only one mark (the tally) is...
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