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  2. Contraposition - Wikipedia

    en.wikipedia.org/wiki/Contraposition

    However, indirect methods such as proof by contradiction can also be used with contraposition, as, for example, in the proof of the irrationality of the square root of 2. By the definition of a rational number , the statement can be made that " If 2 {\displaystyle {\sqrt {2}}} is rational, then it can be expressed as an irreducible fraction ".

  3. List of mathematics-based methods - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematics-based...

    Finite volume method (numerical analysis) Highest averages method (voting systems) Method of exhaustion; Method of infinite descent (number theory) Information bottleneck method; Inverse chain rule method ; Inverse transform sampling method (probability) Iterative method (numerical analysis) Jacobi method (linear algebra) Largest remainder ...

  4. List of common coordinate transformations - Wikipedia

    en.wikipedia.org/wiki/List_of_common_coordinate...

    Note: solving for ′ returns the resultant angle in the first quadrant (< <). To find , one must refer to the original Cartesian coordinate, determine the quadrant in which lies (for example, (3,−3) [Cartesian] lies in QIV), then use the following to solve for :

  5. Transpose - Wikipedia

    en.wikipedia.org/wiki/Transpose

    The transpose of a matrix A, denoted by A T, [3] ⊤ A, A ⊤, , [4] [5] A′, [6] A tr, t A or A t, may be constructed by any one of the following methods: Reflect A over its main diagonal (which runs from top-left to bottom-right) to obtain A T; Write the rows of A as the columns of A T; Write the columns of A as the rows of A T

  6. Verhoeff algorithm - Wikipedia

    en.wikipedia.org/wiki/Verhoeff_algorithm

    [2] [3] It was the first decimal check digit algorithm which detects all single-digit errors, and all transposition errors involving two adjacent digits, [4] which was at the time thought impossible with such a code. The method was independently discovered by H. Peter Gumm in 1985, this time including a formal proof and an extension to any base ...

  7. Conjugate transpose - Wikipedia

    en.wikipedia.org/wiki/Conjugate_transpose

    In mathematics, the conjugate transpose, also known as the Hermitian transpose, of an complex matrix is an matrix obtained by transposing and applying complex conjugation to each entry (the complex conjugate of + being , for real numbers and ).

  8. Damm algorithm - Wikipedia

    en.wikipedia.org/wiki/Damm_algorithm

    For the Damm algorithm with the check equation (...((0 ∗ x m) ∗ x m−1) ∗ ...) ∗ x 0 = 0, a weak totally anti-symmetric quasigroup with the property x ∗ x = 0 is needed. Such a quasigroup can be constructed from any totally anti-symmetric quasigroup by rearranging the columns in such a way that all zeros lay on the diagonal.

  9. Modus tollens - Wikipedia

    en.wikipedia.org/wiki/Modus_tollens

    Every use of modus tollens can be converted to a use of modus ponens and one use of transposition to the premise which is a material implication. For example: If P, then Q. (premise – material implication) If not Q, then not P. (derived by transposition) Not Q. (premise) Therefore, not P. (derived by modus ponens)

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