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  2. Didier Sornette - Wikipedia

    en.wikipedia.org/wiki/Didier_Sornette

    Swiss Finance Institute, UCLA, CNRS. Didier Sornette (born June 25, 1957, in Paris) is a French researcher studying subjects including complex systems and risk management. He is Professor on the Chair of Entrepreneurial Risks at the Swiss Federal Institute of Technology Zurich (ETH Zurich) and is also a professor of the Swiss Finance Institute ...

  3. Smith & Wesson Model 22 - Wikipedia

    en.wikipedia.org/wiki/Smith_&_Wesson_Model_22

    Feed system. six-round cylinder, loaded singly or with two three-round half-moon clips. Sights. blade front sight, notched rear sight. The Smith & Wesson Model 22 is a 6-shot, double-action, large frame revolver chambered in .45 ACP using moon clips. It's a refined commercial version of the M1917 revolver first issued during World War I .

  4. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Mathematics is a field of study that discovers and organizes methods, theories and theorems that are developed and proved for the needs of empirical sciences and mathematics itself. There are many areas of mathematics that include number theory (the study of numbers), algebra (the study of formulas and related structures), geometry (the study ...

  5. Greek letters used in mathematics, science, and engineering

    en.wikipedia.org/wiki/Greek_letters_used_in...

    t. e. Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.

  6. Benoit Mandelbrot - Wikipedia

    en.wikipedia.org/wiki/Benoit_Mandelbrot

    Eugene Fama. Ken Musgrave. Murad Taqqu. Benoit B. [n 1] Mandelbrot [n 2] (20 November 1924 – 14 October 2010) was a Polish-born French-American mathematician and polymath with broad interests in the practical sciences, especially regarding what he labeled as "the art of roughness " of physical phenomena and "the uncontrolled element in life".

  7. Monocoupe Model 22 - Wikipedia

    en.wikipedia.org/wiki/Monocoupe_Model_22

    A later model 90 with an upgraded engine. The prototype monocoupe was first flown on 1 April 1927. The certified version of the Model 22 was approved in January 1928. By the time of certification, the Velie company had bought Central States Aircraft, switching production of the Model 22 with the air-cat engine to the Model 70 with a Velie M-5 ...

  8. 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.

  9. Bell X-22 - Wikipedia

    en.wikipedia.org/wiki/Bell_X-22

    The Bell X-22 is an American V/STOL X-plane with four tilting ducted fans. Takeoff was to selectively occur either with the propellers tilted vertically upwards, or on a short runway with the nacelles tilted forward at approximately 45°. Additionally, the X-22 was to provide more insight into the tactical application of vertical takeoff troop ...