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  2. Belford University - Wikipedia

    en.wikipedia.org/wiki/Belford_University

    Salem Kureshi, the owner of Belford University and Belford High School, agreed to a default judgment against him and his companies in a 2011 class-action lawsuit filed in a U.S. federal court; on June 19, 2012, the court held him in contempt for failing to comply with the terms of the judgment, including a $22.7 million payment. [29] [30]

  3. Rational function - Wikipedia

    en.wikipedia.org/wiki/Rational_function

    Every Laurent polynomial can be written as a rational function while the converse is not necessarily true, i.e., the ring of Laurent polynomials is a subring of the rational functions. The rational function f ( x ) = x x {\displaystyle f(x)={\tfrac {x}{x}}} is equal to 1 for all x except 0, where there is a removable singularity .

  4. Function field (scheme theory) - Wikipedia

    en.wikipedia.org/wiki/Function_field_(scheme_theory)

    The sheaf of rational functions K X of a scheme X is the generalization to scheme theory of the notion of function field of an algebraic variety in classical algebraic geometry. In the case of algebraic varieties , such a sheaf associates to each open set U the ring of all rational functions on that open set; in other words, K X ( U ) is the ...

  5. Function field of an algebraic variety - Wikipedia

    en.wikipedia.org/wiki/Function_field_of_an...

    In algebraic geometry, the function field of an algebraic variety V consists of objects that are interpreted as rational functions on V.In classical algebraic geometry they are ratios of polynomials; in complex geometry these are meromorphic functions and their higher-dimensional analogues; in modern algebraic geometry they are elements of some quotient ring's field of fractions.

  6. Positive-real function - Wikipedia

    en.wikipedia.org/wiki/Positive-real_function

    Over the right half plane, the minimum value of the real part of a PR function occurs on the imaginary axis (because the real part of an analytic function constitutes a harmonic function over the plane, and therefore satisfies the maximum principle). For a rational PR function, the number of poles and number of zeroes differ by at most one.

  7. Category:Test functions for optimization - Wikipedia

    en.wikipedia.org/wiki/Category:Test_functions...

    Pages in category "Test functions for optimization" ... Rosenbrock function; S. Shekel function This page was last edited on 29 December 2023, at 15:34 ...

  8. Rational variety - Wikipedia

    en.wikipedia.org/wiki/Rational_variety

    Lüroth's problem concerns subextensions L of K(X), the rational functions in the single indeterminate X. Any such field is either equal to K or is also rational, i.e. L = K(F) for some rational function F. In geometrical terms this states that a non-constant rational map from the projective line to a curve C can only occur when C also has genus 0.

  9. Radial basis function - Wikipedia

    en.wikipedia.org/wiki/Radial_basis_function

    A radial function is a function : [,).When paired with a norm on a vector space ‖ ‖: [,), a function of the form = (‖ ‖) is said to be a radial kernel centered at .A radial function and the associated radial kernels are said to be radial basis functions if, for any finite set of nodes {} =, all of the following conditions are true: