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  2. Mathematics (journal) - Wikipedia

    en.wikipedia.org/wiki/Mathematics_(journal)

    Mathematics is a semi-monthly peer-reviewed open-access scientific journal that covers all aspects of pure mathematics and applied mathematics. It publishes theoretical and experimental research articles, short communications, and reviews. It was established in 2013 and is published by MDPI.

  3. Theory of functional connections - Wikipedia

    en.wikipedia.org/wiki/Theory_of_functional...

    Representation of solutions: Spectral methods represent the solution as a sum of basis functions, whereas TFC represents the free function as a sum of basis functions. This distinction allows TFC to analytically satisfy the constraints, while spectral methods treat constraints as additional data, approximating them with an accuracy dependent on ...

  4. Closed-form expression - Wikipedia

    en.wikipedia.org/wiki/Closed-form_expression

    The quadratic formula =. is a closed form of the solutions to the general quadratic equation + + =. More generally, in the context of polynomial equations, a closed form of a solution is a solution in radicals; that is, a closed-form expression for which the allowed functions are only n th-roots and field operations (+,,, /).

  5. Ordinary differential equation - Wikipedia

    en.wikipedia.org/wiki/Ordinary_differential_equation

    A particular solution is derived from the general solution by setting the constants to particular values, often chosen to fulfill set 'initial conditions or boundary conditions'. [22] A singular solution is a solution that cannot be obtained by assigning definite values to the arbitrary constants in the general solution.

  6. Hilbert's problems - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_problems

    Problems 1, 2, 5, 6, [a] 9, 11, 12, 15, and 22 have solutions that have partial acceptance, but there exists some controversy as to whether they resolve the problems. That leaves 8 (the Riemann hypothesis ), 13 and 16 [ b ] unresolved.

  7. Equation solving - Wikipedia

    en.wikipedia.org/wiki/Equation_solving

    In mathematics, to solve an equation is to find its solutions, which are the values (numbers, functions, sets, etc.) that fulfill the condition stated by the equation, consisting generally of two expressions related by an equals sign. When seeking a solution, one or more variables are designated as unknowns. A solution is an assignment of ...

  8. PG (3,2) - Wikipedia

    en.wikipedia.org/wiki/PG(3,2)

    A packing of PG(3, 2) is a partition of the 35 lines into 7 disjoint spreads of 5 lines each, and corresponds to a solution for all seven days. There are 240 packings of PG(3, 2), that fall into two conjugacy classes of 120 under the action of PGL(4, 2) (the collineation group of the space); a correlation interchanges these two classes. [6]

  9. Distribution (mathematics) - Wikipedia

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

    The following notation will be used throughout this article: is a fixed positive integer and is a fixed non-empty open subset of Euclidean space. = {,,, …} denotes the natural numbers.