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  2. Constructible number - Wikipedia

    en.wikipedia.org/wiki/Constructible_number

    The square root of 2 is equal to the length of the hypotenuse of a right triangle with legs of length 1 and is therefore a constructible number. In geometry and algebra, a real number is constructible if and only if, given a line segment of unit length, a line segment of length | | can be constructed with compass and straightedge in a finite number of steps.

  3. Definable real number - Wikipedia

    en.wikipedia.org/wiki/Definable_real_number

    The square root of 2 is equal to the length of the hypotenuse of a right triangle with legs of length 1 and is therefore a constructible number. Informally, a definable real number is a real number that can be uniquely specified by its description.

  4. Constructible function - Wikipedia

    en.wikipedia.org/wiki/Constructible_function

    There are two different definitions of a time-constructible function. In the first definition, a function f is called time-constructible if there exists a positive integer n 0 and Turing machine M which, given a string 1 n consisting of n ones, stops after exactly f(n) steps for all n ≥ n 0.

  5. Transcendental number - Wikipedia

    en.wikipedia.org/wiki/Transcendental_number

    In mathematics, a transcendental number is a real or complex number that is not algebraic: that is, not the root of a non-zero polynomial with integer (or, equivalently, rational) coefficients. The best-known transcendental numbers are π and e. [1] [2] The quality of a number being transcendental is called transcendence.

  6. Constructive proof - Wikipedia

    en.wikipedia.org/wiki/Constructive_proof

    Such counterexamples do not disprove a statement, however; they only show that, at present, no constructive proof of the statement is known. One weak counterexample begins by taking some unsolved problem of mathematics, such as Goldbach's conjecture , which asks whether every even natural number larger than 4 is the sum of two primes.

  7. Algebraic number - Wikipedia

    en.wikipedia.org/wiki/Algebraic_number

    The square root of 2 is an algebraic number equal to the length of the hypotenuse of a right triangle with legs of length 1.. An algebraic number is a number that is a root of a non-zero polynomial in one variable with integer (or, equivalently, rational) coefficients.

  8. Would a government shutdown affect mail delivery? What to know

    www.aol.com/news/government-shutdown-affect-mail...

    The U.S. Postal Service would be unaffected because it does not depend on Congress for funding. In a statement posted to their website on Sept. 29, 2023, ...

  9. Undefined (mathematics) - Wikipedia

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

    In mathematics, the term undefined refers to a value, function, or other expression that cannot be assigned a meaning within a specific formal system. [1]Attempting to assign or use an undefined value within a particular formal system, may produce contradictory or meaningless results within that system.