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  2. Irrational number - Wikipedia

    en.wikipedia.org/wiki/Irrational_number

    The number √ 2 is irrational.. In mathematics, the irrational numbers (in-+ rational) are all the real numbers that are not rational numbers.That is, irrational numbers cannot be expressed as the ratio of two integers.

  3. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.

  4. Category:Irrational numbers - Wikipedia

    en.wikipedia.org/wiki/Category:Irrational_numbers

    In mathematics, an irrational number is any real number that is not a rational number, i.e., one that cannot be written as a fraction a / b with a and b integers and b not zero. This is also known as being incommensurable, or without common measure. The irrational numbers are precisely those numbers whose expansion in any given base (decimal ...

  5. Apéry's theorem - Wikipedia

    en.wikipedia.org/wiki/Apéry's_theorem

    In mathematics, Apéry's theorem is a result in number theory that states the Apéry's constant ζ(3) is irrational.That is, the number = = = + + + = …cannot be written as a fraction / where p and q are integers.

  6. Square root of 3 - Wikipedia

    en.wikipedia.org/wiki/Square_root_of_3

    The square root of 3 is the positive real number that, ... "A geometric proof that sqrt 3, sqrt 5, and sqrt 7 are irrational". arXiv: 2003.06627 . Further reading

  7. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    3.14159 26535 89793 23846 ... The number Λ such that ... is irrational. If true, this will prove the twin prime conjecture. ...

  8. Commensurability (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Commensurability_(mathematics)

    For example, the numbers 3 and 2 are commensurable because their ratio, ⁠ 3 / 2 ⁠, is a rational number. The numbers and are ... is an irrational number.

  9. Rational number - Wikipedia

    en.wikipedia.org/wiki/Rational_number

    A real number that is not rational is called irrational. [5] Irrational numbers include the square root of 2 (⁠ ⁠), π, e, and the golden ratio (φ). Since the set of rational numbers is countable, and the set of real numbers is uncountable, almost all real numbers are irrational. [1]