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  2. No free lunch in search and optimization - Wikipedia

    en.wikipedia.org/wiki/No_free_lunch_in_search...

    The problem is to rapidly find a solution among candidates a, b, and c that is as good as any other, where goodness is either 0 or 1. There are eight instances ("lunch plates") fxyz of the problem, where x, y, and z indicate the goodness of a, b, and c, respectively.

  3. List of NP-complete problems - Wikipedia

    en.wikipedia.org/wiki/List_of_NP-complete_problems

    New York: W. H. Freeman and Company. ISBN 9780716710455. MR 0519066. OCLC 247570676.. This book is a classic, developing the theory, then cataloguing many NP-Complete problems. Cook, S.A. (1971). "The complexity of theorem proving procedures". Proceedings, Third Annual ACM Symposium on the Theory of Computing, ACM, New York. pp. 151– 158.

  4. Behrens–Fisher problem - Wikipedia

    en.wikipedia.org/wiki/Behrens–Fisher_problem

    In statistics, the Behrens–Fisher problem, named after Walter-Ulrich Behrens and Ronald Fisher, is the problem of interval estimation and hypothesis testing concerning the difference between the means of two normally distributed populations when the variances of the two populations are not assumed to be equal, based on two independent samples.

  5. Homotopy principle - Wikipedia

    en.wikipedia.org/wiki/Homotopy_principle

    In mathematics, the homotopy principle (or h-principle) is a very general way to solve partial differential equations (PDEs), and more generally partial differential relations (PDRs). The h-principle is good for underdetermined PDEs or PDRs, such as the immersion problem, isometric immersion problem, fluid dynamics, and other areas.

  6. Banach's matchbox problem - Wikipedia

    en.wikipedia.org/wiki/Banach's_matchbox_problem

    Banach's match problem is a classic problem in probability attributed to Stefan Banach. Feller [ 1 ] says that the problem was inspired by a humorous reference to Banach's smoking habit in a speech honouring him by Hugo Steinhaus , but that it was not Banach who set the problem or provided an answer.

  7. Three Hours To Change Your Life - images.huffingtonpost.com

    images.huffingtonpost.com/2013-01-04-ThreeHours...

    think and perform, and to empower you to new levels of personal effectiveness and fulfillment. In a three-hour process of self-discovery, you stand back, take stock and then plan the next year of your life. The exercise of answering 10 simple questions helps you to clarify your thinking and make sure your next year is the best it can be. At the end

  8. Hierarchy problem - Wikipedia

    en.wikipedia.org/wiki/Hierarchy_problem

    In theoretical physics, the hierarchy problem is the problem concerning the large discrepancy between aspects of the weak force and gravity. [1] There is no scientific consensus on why, for example, the weak force is 10 24 times stronger than gravity .

  9. Boeing’s ongoing problems. On January 6, the FAA grounded approximately 171 Boeing 737 Max 9 planes after a left mid-cabin door plug blew out of Alaska Airlines Flight 1282 while in flight.