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  2. Grubel–Lloyd index - Wikipedia

    en.wikipedia.org/wiki/GrubelLloyd_index

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

  3. Excelsior (chess problem) - Wikipedia

    en.wikipedia.org/wiki/Excelsior_(chess_problem)

    Loyd had a friend who was willing to wager that he could always find the piece which delivered the principal mate of a chess problem. Loyd composed this problem as a joke and bet his friend dinner that he could not pick a piece that didn't give mate in the main line (his friend immediately identified the pawn on b2 as being the least likely to deliver mate), and when the problem was published ...

  4. Chebychev–Grübler–Kutzbach criterion - Wikipedia

    en.wikipedia.org/wiki/Chebychev–Grübler...

    A single unconstrained body soaring in 3-space has 6 degrees of freedom: 3 translational (say, x,y,z); and 3 rotational (say, roll, pitch, yaw). So a system of n {\displaystyle n} unconnected rigid bodies moving in space (a flock of n {\displaystyle n} soaring seagulls) has 6 n {\displaystyle 6n} degrees of freedom measured relative to a fixed ...

  5. HHL algorithm - Wikipedia

    en.wikipedia.org/wiki/HHL_algorithm

    The Harrow–Hassidim–Lloyd algorithm or HHL algorithm is a quantum algorithm for numerically solving a system of linear equations, designed by Aram Harrow, Avinatan Hassidim, and Seth Lloyd. The algorithm estimates the result of a scalar measurement on the solution vector to a given linear system of equations.

  6. Spectral method - Wikipedia

    en.wikipedia.org/wiki/Spectral_method

    For very small problems, the spectral method is unique in that solutions may be written out symbolically, yielding a practical alternative to series solutions for differential equations. Spectral methods can be computationally less expensive and easier to implement than finite element methods; they shine best when high accuracy is sought in ...

  7. Roark's Formulas for Stress and Strain - Wikipedia

    en.wikipedia.org/wiki/Roark's_Formulas_for_Stress...

    It also features expanded tables and cases, improved notations and figures within the tables, consistent table and equation numbering, and verification of correction factors. The formulas are organized into tables in a hierarchical format: chapter, table, case, subcase, and each case and subcase is accompanied by diagrams.

  8. Numerical methods for linear least squares - Wikipedia

    en.wikipedia.org/wiki/Numerical_methods_for...

    The equation = is known as the normal equation. The algebraic solution of the normal equations with a full-rank matrix X T X can be written as ^ = = + where X + is the Moore–Penrose pseudoinverse of X.

  9. Grubel - Wikipedia

    en.wikipedia.org/wiki/Grubel

    Grubel or Grübel is a surname. Notable people with the surname include: Notable people with the surname include: Herb Grubel (born 1934), Canadian politician