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Starting at 0 or 1 has long been a matter of definition. In 1727, Bernard Le Bovier de Fontenelle wrote that his notions of distance and element led to defining the natural numbers as including or excluding 0. [23] In 1889, Giuseppe Peano used N for the positive integers and started at 1, [24] but he later changed to using N 0 and N 1. [25]
The integers arranged on a number line. An integer is the number zero (), a positive natural number (1, 2, 3, . . .), or the negation of a positive natural number ...
The seven partitions of 5 are 5; 4 + 1; 3 + 2; 3 + 1 + 1; 2 + 2 + 1; 2 + 1 + 1 + 1; 1 + 1 + 1 + 1 + 1; Some authors treat a partition as a decreasing sequence of ...
7 (seven) is the natural number following 6 and preceding 8.It is the only prime number preceding a cube.. As an early prime number in the series of positive integers, the number seven has greatly symbolic associations in religion, mythology, superstition and philosophy.
A six-sided polygon is a hexagon, [1] one of the three regular polygons capable of tiling the plane.A hexagon also has 6 edges as well as 6 internal and external angles.. 6 is the second smallest composite number. [1]
Formally, a regular number is an integer of the form , for nonnegative integers , , and .Such a number is a divisor of (⌈ / ⌉,,).The regular numbers are also called 5-smooth, indicating that their greatest prime factor is at most 5. [2]
The section sign (§) is a typographical character for referencing individually numbered sections of a document; it is frequently used when citing sections of a legal code. [1]
The Iran–Contra affair (Persian: ماجرای ایران-کنترا; Spanish: Caso Irán-Contra), also referred to as the Iran–Contra scandal, the Iran Initiative, or simply Iran–Contra, was a political scandal in the United States that centered around arms trafficking to Iran between 1981 to 1986, facilitated by senior officials of the Ronald Reagan administration.