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  2. Irrational number - Wikipedia

    en.wikipedia.org/wiki/Irrational_number

    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. When the ratio of lengths of two line segments is an irrational number, the line segments are also ...

  3. Category:Irrational numbers - Wikipedia

    en.wikipedia.org/wiki/Category:Irrational_numbers

    Wikimedia Commons has media related to 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 ...

  4. Algebraic number - Wikipedia

    en.wikipedia.org/wiki/Algebraic_number

    Any rational number, expressed as the quotient of an integer a and a (non-zero) natural number b, satisfies the above definition, because x = a / b is the root of a non-zero polynomial, namely bx − a. Quadratic irrational numbers, irrational solutions of a quadratic polynomial ax 2 + bx + c with integer coefficients a, b, and c, are

  5. Quadratic irrational number - Wikipedia

    en.wikipedia.org/wiki/Quadratic_irrational_number

    In mathematics, a quadratic irrational number (also known as a quadratic irrational or quadratic surd) is an irrational number that is the solution to some quadratic equation with rational coefficients which is irreducible over the rational numbers. [1] Since fractions in the coefficients of a quadratic equation can be cleared by multiplying ...

  6. Rational number - Wikipedia

    en.wikipedia.org/wiki/Rational_number

    In mathematics, a rational number is a number that can be expressed as the quotient or fraction of two integers, a numerator p and a non-zero denominator q. [1] For example, is a rational number, as is every integer (e.g., ). The set of all rational numbers, also referred to as " the rationals ", [2] the field of rationals [3] or the field of ...

  7. Hippasus - Wikipedia

    en.wikipedia.org/wiki/Hippasus

    Hippasus of Metapontum ( / ˈhɪpəsəs /; Greek: Ἵππασος ὁ Μεταποντῖνος, Híppasos; c. 530 – c. 450 BC) [1] was a Greek philosopher and early follower of Pythagoras. [2] [3] Little is known about his life or his beliefs, but he is sometimes credited with the discovery of the existence of irrational numbers. The ...

  8. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    Set inclusions between the natural numbers (ℕ), the integers (ℤ), the rational numbers (ℚ), the real numbers (ℝ), and the complex numbers (ℂ). A number is a mathematical object used to count, measure, and label.

  9. Richard Dedekind - Wikipedia

    en.wikipedia.org/wiki/Richard_Dedekind

    Julius Wilhelm Richard Dedekind [ˈdeːdəˌkɪnt] (6 October 1831 – 12 February 1916) was a German mathematician who made important contributions to number theory, abstract algebra (particularly ring theory ), and the axiomatic foundations of arithmetic. His best known contribution is the definition of real numbers through the notion of ...

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