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  2. Silverman–Toeplitz theorem - Wikipedia

    en.wikipedia.org/wiki/SilvermanToeplitz_theorem

    In mathematics, the SilvermanToeplitz theorem, first proved by Otto Toeplitz, is a result in series summability theory characterizing matrix summability methods that are regular. A regular matrix summability method is a linear sequence transformation that preserves the limits of convergent sequences . [ 1 ]

  3. Otto Toeplitz - Wikipedia

    en.wikipedia.org/wiki/Otto_Toeplitz

    In 1913 Toeplitz became an extraordinary professor at the University of Kiel. He was promoted to a professor in 1920. In 1911, Toeplitz proposed the inscribed square problem: Does every Jordan curve contain an inscribed square? This has been established for convex curves and smooth curves, but the question remains open in general (2007).

  4. Inscribed square problem - Wikipedia

    en.wikipedia.org/wiki/Inscribed_square_problem

    The inscribed square problem, also known as the square peg problem or the Toeplitz' conjecture, is an unsolved question in geometry: Does every plane simple closed curve contain all four vertices of some square? This is true if the curve is convex or piecewise smooth and in other special cases. The problem was proposed by Otto Toeplitz in 1911. [1]

  5. Toeplitz matrix - Wikipedia

    en.wikipedia.org/wiki/Toeplitz_matrix

    is called a Toeplitz system if is a Toeplitz matrix. If A {\displaystyle A} is an n × n {\displaystyle n\times n} Toeplitz matrix, then the system has at most only 2 n − 1 {\displaystyle 2n-1} unique values, rather than n 2 {\displaystyle n^{2}} .

  6. Hilbert's problems - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_problems

    The 6th problem concerns the axiomatization of physics, a goal that 20th-century developments seem to render both more remote and less important than in Hilbert's time. Also, the 4th problem concerns the foundations of geometry, in a manner that is now generally judged to be too vague to enable a definitive answer.

  7. Szegő limit theorems - Wikipedia

    en.wikipedia.org/wiki/Szegő_limit_theorems

    In mathematical analysis, the Szegő limit theorems describe the asymptotic behaviour of the determinants of large Toeplitz matrices. [ 1 ] [ 2 ] [ 3 ] They were first proved by Gábor Szegő . Notation

  8. Topological degree theory - Wikipedia

    en.wikipedia.org/wiki/Topological_degree_theory

    In mathematics, topological degree theory is a generalization of the winding number of a curve in the complex plane. It can be used to estimate the number of solutions of an equation, and is closely connected to fixed-point theory. When one solution of an equation is easily found, degree theory can often be used to prove existence of a second ...

  9. DFT matrix - Wikipedia

    en.wikipedia.org/wiki/DFT_matrix

    The appropriate choice of scaling to achieve unitarity is /, so that the energy in the physical domain will be the same as the energy in the Fourier domain, i.e., to satisfy Parseval's theorem. (Other, non-unitary, scalings, are also commonly used for computational convenience; e.g., the convolution theorem takes on a slightly simpler form with ...