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  2. Arnold's cat map - Wikipedia

    en.wikipedia.org/wiki/Arnold's_cat_map

    Arnold's cat map is a particularly well-known example of a hyperbolic toral automorphism, which is an automorphism of a torus given by a square unimodular matrix having no eigenvalues of absolute value 1. [3] The set of the points with a periodic orbit is dense on the torus. Actually a point is periodic if and only if its coordinates are rational.

  3. Mueller calculus - Wikipedia

    en.wikipedia.org/wiki/Mueller_calculus

    Mueller calculus is a matrix method for manipulating Stokes vectors, which represent the polarization of light. It was developed in 1943 by Hans Mueller . In this technique, the effect of a particular optical element is represented by a Mueller matrix—a 4×4 matrix that is an overlapping generalization of the Jones matrix .

  4. Arnold diffusion - Wikipedia

    en.wikipedia.org/wiki/Arnold_diffusion

    Arnold conjectured that "the mechanism of 'transition chains' which guarantees that nonstability in our example is also applicable to the general case (for example, to the problem of three bodies)." [1] The KAM theorem and Arnold diffusion has led to a compendium of rigorous mathematical results, with insights from physics. [3] [4]

  5. Matrix calculus - Wikipedia

    en.wikipedia.org/wiki/Matrix_calculus

    In mathematics, matrix calculus is a specialized notation for doing multivariable calculus, especially over spaces of matrices.It collects the various partial derivatives of a single function with respect to many variables, and/or of a multivariate function with respect to a single variable, into vectors and matrices that can be treated as single entities.

  6. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  7. Matrix polynomial - Wikipedia

    en.wikipedia.org/wiki/Matrix_polynomial

    A matrix polynomial identity is a matrix polynomial equation which holds for all matrices A in a specified matrix ring M n (R). Matrix polynomials are often demonstrated in undergraduate linear algebra classes due to their relevance in showcasing properties of linear transformations represented as matrices, most notably the Cayley–Hamilton ...

  8. Obituary: Sydell L. Miller, Matrix Essentials maven and ... - AOL

    www.aol.com/news/obituary-sydell-l-miller-matrix...

    Sydell Miller, who cofounded the Matrix Essentials beauty-and-hair-products empire and had ties to Cleveland, Palm Beach, died Feb. 25, 2024, at 86. Obituary: Sydell L. Miller, Matrix Essentials ...

  9. List of theorems - Wikipedia

    en.wikipedia.org/wiki/List_of_theorems

    Gershgorin circle theorem (matrix theory) Inverse eigenvalues theorem (linear algebra) Perron–Frobenius theorem (matrix theory) Principal axis theorem (linear algebra) Rank–nullity theorem (linear algebra) Rouché–Capelli theorem (Linear algebra) Sinkhorn's theorem (matrix theory) Specht's theorem (matrix theory)