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  2. Research & Education Association - Wikipedia

    en.wikipedia.org/wiki/Research_&_Education...

    REA was founded by Max Fogiel in 1959 as an educational publisher, concentrating on problems and solutions, or what's known as test preparation today. The company produced the iconic "Problem Solver" series of comprehensive solution guides.

  3. Riemann solver - Wikipedia

    en.wikipedia.org/wiki/Riemann_solver

    Generally speaking, Riemann solvers are specific methods for computing the numerical flux across a discontinuity in the Riemann problem. [1] They form an important part of high-resolution schemes; typically the right and left states for the Riemann problem are calculated using some form of nonlinear reconstruction, such as a flux limiter or a WENO method, and then used as the input for the ...

  4. Cosmological constant problem - Wikipedia

    en.wikipedia.org/wiki/Cosmological_constant_problem

    In addition, some of the proposals are arguably incomplete, because they solve the "new" cosmological constant problem by proposing that the actual cosmological constant is exactly zero rather than a tiny number, but fail to solve the "old" cosmological constant problem of why quantum fluctuations seem to fail to produce substantial vacuum ...

  5. Scientists make ‘rare advance’ in tackling the oldest ...

    www.aol.com/scientists-rare-advance-tackling...

    “Turbulence, as the authors say, is a multi-scale problem, i.e., turbulence can span from thousands of lightyears to less than a foot,” he said via email. “We want to know how these scales ...

  6. Millennium Prize Problems - Wikipedia

    en.wikipedia.org/wiki/Millennium_Prize_Problems

    The seven selected problems span a number of mathematical fields, namely algebraic geometry, arithmetic geometry, geometric topology, mathematical physics, number theory, partial differential equations, and theoretical computer science. Unlike Hilbert's problems, the problems selected by the Clay Institute were already renowned among ...

  7. Roe solver - Wikipedia

    en.wikipedia.org/wiki/Roe_solver

    The Roe approximate Riemann solver, devised by Phil Roe, is an approximate Riemann solver based on the Godunov scheme and involves finding an estimate for the intercell numerical flux or Godunov flux + at the interface between two computational cells and +, on some discretised space-time computational domain.

  8. Simon problems - Wikipedia

    en.wikipedia.org/wiki/Simon_problems

    In 2014, Artur Avila won a Fields Medal for work including the solution of three Simon problems. [5] [6] Among these was the problem of proving that the set of energy levels of one particular abstract quantum system was, in fact, the Cantor set, a challenge known as the "Ten Martini Problem" after the reward that Mark Kac offered for solving it ...

  9. Riemann problem - Wikipedia

    en.wikipedia.org/wiki/Riemann_problem

    A Riemann problem, named after Bernhard Riemann, is a specific initial value problem composed of a conservation equation together with piecewise constant initial data which has a single discontinuity in the domain of interest.

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