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  2. 2 + 2 = 5 - Wikipedia

    en.wikipedia.org/wiki/2_+_2_=_5

    As a theme and as a subject in the arts, the anti-intellectual slogan 2 + 2 = 5 pre-dates Orwell and has produced literature, such as Deux et deux font cinq (Two and Two Make Five), written in 1895 by Alphonse Allais, which is a collection of absurdist short stories; [1] and the 1920 imagist art manifesto 2 × 2 = 5 by the poet Vadim ...

  3. Mathematical fallacy - Wikipedia

    en.wikipedia.org/wiki/Mathematical_fallacy

    In mathematics, certain kinds of mistaken proof are often exhibited, and sometimes collected, as illustrations of a concept called mathematical fallacy.There is a distinction between a simple mistake and a mathematical fallacy in a proof, in that a mistake in a proof leads to an invalid proof while in the best-known examples of mathematical fallacies there is some element of concealment or ...

  4. Equation - Wikipedia

    en.wikipedia.org/wiki/Equation

    When R is chosen to have the value of 2 (R = 2), this equation would be recognized in Cartesian coordinates as the equation for the circle of radius of 2 around the origin. Hence, the equation with R unspecified is the general equation for the circle. Usually, the unknowns are denoted by letters at the end of the alphabet, x, y, z, w ...

  5. Proof by infinite descent - Wikipedia

    en.wikipedia.org/wiki/Proof_by_infinite_descent

    The method was much later developed by Fermat, who coined the term and often used it for Diophantine equations. [4] [5] Two typical examples are showing the non-solvability of the Diophantine equation + = and proving Fermat's theorem on sums of two squares, which states that an odd prime p can be expressed as a sum of two squares when () (see ...

  6. Extraneous and missing solutions - Wikipedia

    en.wikipedia.org/wiki/Extraneous_and_missing...

    This counterintuitive result occurs because in the case where =, multiplying both sides by multiplies both sides by zero, and so necessarily produces a true equation just as in the first example. In general, whenever we multiply both sides of an equation by an expression involving variables, we introduce extraneous solutions wherever that ...

  7. Beal conjecture - Wikipedia

    en.wikipedia.org/wiki/Beal_conjecture

    To illustrate, the solution + = has bases with a common factor of 3, the solution + = has bases with a common factor of 7, and + = + has bases with a common factor of 2. Indeed the equation has infinitely many solutions where the bases share a common factor, including generalizations of the above three examples, respectively

  8. Equation solving - Wikipedia

    en.wikipedia.org/wiki/Equation_solving

    Solving an equation symbolically means that expressions can be used for representing the solutions. For example, the equation x + y = 2x – 1 is solved for the unknown x by the expression x = y + 1, because substituting y + 1 for x in the equation results in (y + 1) + y = 2(y + 1) – 1, a true statement.

  9. Power of two - Wikipedia

    en.wikipedia.org/wiki/Power_of_two

    For example, 1 099 511 627 776 bytes = 1 terabyte [5] or tebibyte. 2 50 = 1 125 899 906 842 624 The binary approximation of the peta-, or 1 000 000 000 000 000 multiplier. 1 125 899 906 842 624 bytes = 1 petabyte [5] or pebibyte. 2 53 = 9 007 199 254 740 992 The number until which all integer values can exactly be represented in IEEE double ...