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  2. Rational number - Wikipedia

    en.wikipedia.org/wiki/Rational_number

    In mathematics, "rational" is often used as a noun abbreviating "rational number". The adjective rational sometimes means that the coefficients are rational numbers. For example, a rational point is a point with rational coordinates (i.e., a point whose coordinates are rational numbers); a rational matrix is a matrix of rational numbers; a rational polynomial may be a polynomial with rational ...

  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. Algebraic number - Wikipedia

    en.wikipedia.org/wiki/Algebraic_number

    An algebraic number is a number that is a root of a non-zero polynomial in one variable with integer (or, equivalently, rational) coefficients. For example, the golden ratio , ( 1 + 5 ) / 2 {\displaystyle (1+{\sqrt {5}})/2} , is an algebraic number, because it is a root of the polynomial x 2 − x − 1 .

  5. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    As the number of these sorts has remarkably increased in modern mathematics, the Greek alphabet and some Hebrew letters are also used. In mathematical formulas , the standard typeface is italic type for Latin letters and lower-case Greek letters, and upright type for upper case Greek letters.

  6. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    In mathematics, the notion of number has been extended over the centuries to include zero (0), [3] negative numbers, [4] rational numbers such as one half (), real numbers such as the square root of 2 and π, [5] and complex numbers [6] which extend the real numbers with a square root of −1 (and its combinations with real numbers by adding or ...

  7. Real number - Wikipedia

    en.wikipedia.org/wiki/Real_number

    In mathematics, a real number is a number that can be used to measure a continuous ... Firstly both definitions suppose that rational numbers and thus natural numbers ...

  8. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    In mathematics a rational number is a number that can be represented by a fraction of the form ⁠ a / b ⁠, where a and b are integers and b is not zero; the set of all rational numbers is commonly represented by the symbol Q or ⁠ ⁠, which stands for quotient.

  9. Dedekind cut - Wikipedia

    en.wikipedia.org/wiki/Dedekind_cut

    Dedekind used his cut to construct the irrational, real numbers.. In mathematics, Dedekind cuts, named after German mathematician Richard Dedekind (but previously considered by Joseph Bertrand [1] [2]), are а method of construction of the real numbers from the rational numbers.