**1.**

Fundamental mathematical property of 1 is to be a multiplicative identity, meaning that any number multiplied by 1 equals the same number.

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Fundamental mathematical property of 1 is to be a multiplicative identity, meaning that any number multiplied by 1 equals the same number.

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Additionally, 1 is the smallest possible difference between two distinct natural numbers.

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Glyph used today in the Western world to represent the number 1, a vertical line, often with a serif at the top and sometimes a short horizontal line at the bottom, traces its roots back to the Brahmic script of ancient India, where it was a simple vertical line.

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In styles in which the digit 1 is written with a long upstroke, the digit 7 is often written with a horizontal stroke through the vertical line, to disambiguate them.

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Styles that do not use the long upstroke on digit 1 usually do not use the horizontal stroke through the vertical of the digit 7 either.

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Many older typewriters lack a separate key for 1, using the lowercase letter l or uppercase I instead.

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However, 1 is especially common for the multiplicative identity of a ring, i e, when an addition and 0 are present.

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In category theory, 1 is sometimes used to denote the terminal object of a category.

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In number theory, 1 is the value of Legendre's constant, which was introduced in 1808 by Adrien-Marie Legendre in expressing the asymptotic behavior of the prime-counting function.

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In many professional sports, the number 1 is assigned to the player who is first or leading in some respect, or otherwise important; the number is printed on his sports uniform or equipment.

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