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  2. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Rational numbers (): Numbers that can be expressed as a ratio of an integer to a non-zero integer. [3] All integers are rational, but there are rational numbers that are not integers, such as −2/9. Real numbers (): Numbers that correspond to points along a line. They can be positive, negative, or zero.

  3. Non-integer base of numeration - Wikipedia

    en.wikipedia.org/wiki/Non-integer_base_of_numeration

    The numbers d i are non-negative integers less than β. This is also known as a β -expansion , a notion introduced by Rényi (1957) and first studied in detail by Parry (1960) . Every real number has at least one (possibly infinite) β -expansion.

  4. List of numbers - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/List_of_numbers

    A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

  5. Almost integer - Wikipedia

    en.wikipedia.org/wiki/Almost_integer

    Some examples of almost integers are high powers of the golden ratio = +, for example: = + = + = + The fact that these powers approach integers is non-coincidental, because the golden ratio is a Pisot–Vijayaraghavan number.

  6. Natural number - Wikipedia

    en.wikipedia.org/wiki/Natural_number

    Natural numbers are also used as labels, like jersey numbers on a sports team, where they serve as nominal numbers and do not have mathematical properties. [5] The natural numbers form a set, commonly symbolized as a bold N or blackboard bold ⁠ ⁠. Many other number sets are built from the natural numbers. For example, the integers are made ...

  7. List of prime numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_prime_numbers

    This is a list of articles about prime numbers. A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes.

  8. Regular number - Wikipedia

    en.wikipedia.org/wiki/Regular_number

    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]

  9. Glossary of number theory - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_number_theory

    A number field, also called an algebraic number field, is a finite-degree field extension of the field of rational numbers. non-abelian The non-abelian class field theory is an extension of the class field theory (which is about abelian extensions of number fields) to non-abelian extensions; or at least the idea of such a theory. The non ...

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