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  2. Grubel–Lloyd index - Wikipedia

    en.wikipedia.org/wiki/GrubelLloyd_index

    The Grubel–Lloyd index measures intra-industry trade of a particular product. It was introduced by Herb Grubel and Peter Lloyd in 1971. = (+) ...

  3. Intra-industry trade - Wikipedia

    en.wikipedia.org/wiki/Intra-industry_trade

    Various indexes of IIT have been created, including the Grubel–Lloyd index, the Balassa index, the Aquino index, the Bergstrand index and the Glesjer index. Research suggests that IIT is not simply a fiction or artifact produced by statistical classifications and definitions, but very much a reality.

  4. Herb Grubel - Wikipedia

    en.wikipedia.org/wiki/Herb_Grubel

    Grubel has published 27 books and more than 130 professional articles in economics, dealing with international trade and finance and a wide range of economic policy issues. One of his most important contributions to international economics is the Grubel–Lloyd index , which measures intra-industry trade of a particular product.

  5. 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.

  6. Coefficient of determination - Wikipedia

    en.wikipedia.org/wiki/Coefficient_of_determination

    Ordinary least squares regression of Okun's law.Since the regression line does not miss any of the points by very much, the R 2 of the regression is relatively high.. In statistics, the coefficient of determination, denoted R 2 or r 2 and pronounced "R squared", is the proportion of the variation in the dependent variable that is predictable from the independent variable(s).

  7. Boundary value problem - Wikipedia

    en.wikipedia.org/wiki/Boundary_value_problem

    Boundary value problems are similar to initial value problems.A boundary value problem has conditions specified at the extremes ("boundaries") of the independent variable in the equation whereas an initial value problem has all of the conditions specified at the same value of the independent variable (and that value is at the lower boundary of the domain, thus the term "initial" value).

  8. Frobenius method - Wikipedia

    en.wikipedia.org/wiki/Frobenius_method

    Some solutions of a differential equation having a regular singular point with indicial roots = and .. In mathematics, the method of Frobenius, named after Ferdinand Georg Frobenius, is a way to find an infinite series solution for a linear second-order ordinary differential equation of the form ″ + ′ + = with ′ and ″.

  9. Nick Trefethen - Wikipedia

    en.wikipedia.org/wiki/Nick_Trefethen

    Lloyd Nicholas Trefethen FRS [1] (born 30 August 1955) is an American mathematician, professor of numerical analysis and until 2023 head of the Numerical Analysis Group at the Mathematical Institute, University of Oxford.