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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. Diophantine approximation - Wikipedia

    en.wikipedia.org/wiki/Diophantine_approximation

    The first problem was to know how well a real number can be approximated by rational numbers. For this problem, a rational number p / q is a "good" approximation of a real number α if the absolute value of the difference between p / q and α may not decrease if p / q is replaced by another rational number with a smaller denominator.

  4. Elementary mathematics - Wikipedia

    en.wikipedia.org/wiki/Elementary_mathematics

    Rational number is any number that can be expressed as the quotient or fraction p/q of two integers, with the denominator q not equal to zero. [9] Since q may be equal to 1, every integer is a rational number. The set of all rational numbers is usually denoted by a boldface Q (or blackboard bold).

  5. Category:Rational numbers - Wikipedia

    en.wikipedia.org/wiki/Category:Rational_numbers

    This category represents all rational numbers, that is, those real numbers which can be represented in the form: ...where and are integers and is not equal to zero. All integers are rational, including zero.

  6. Congruent number problem - Wikipedia

    en.wikipedia.org/wiki/Congruent_number

    Triangle with the area 6, a congruent number. In number theory, a congruent number is a positive integer that is the area of a right triangle with three rational number sides. [1] [2] A more general definition includes all positive rational numbers with this property. [3] The sequence of (integer) congruent numbers starts with

  7. Dirichlet's approximation theorem - Wikipedia

    en.wikipedia.org/wiki/Dirichlet's_approximation...

    In his Essai sur la théorie des nombres (1798), Adrien-Marie Legendre derives a necessary and sufficient condition for a rational number to be a convergent of the simple continued fraction of a given real number. [4] A consequence of this criterion, often called Legendre's theorem within the study of continued fractions, is as follows: [5 ...

  8. Hilbert's seventeenth problem - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_seventeenth_problem

    Hilbert's seventeenth problem is one of the 23 Hilbert problems set out in a celebrated list compiled in 1900 by David Hilbert. It concerns the expression of positive definite rational functions as sums of quotients of squares .

  9. Dirichlet function - Wikipedia

    en.wikipedia.org/wiki/Dirichlet_function

    For any real number x and any positive rational number T, (+) = (). The Dirichlet function is therefore an example of a real periodic function which is not constant but whose set of periods, the set of rational numbers, is a dense subset of R {\displaystyle \mathbb {R} } .

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