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  2. Winkel tripel projection - Wikipedia

    en.wikipedia.org/wiki/Winkel_tripel_projection

    Winkel tripel projection of the world, 15° graticule The Winkel tripel projection with Tissot's indicatrix of deformation The Winkel tripel projection (Winkel III), a modified azimuthal [1] map projection of the world, is one of three projections proposed by German cartographer Oswald Winkel (7 January 1874 – 18 July 1953) in 1921.

  3. Points of the compass - Wikipedia

    en.wikipedia.org/wiki/Points_of_the_compass

    32-point compass rose. The points of the compass are a set of horizontal, radially arrayed compass directions (or azimuths) used in navigation and cartography.A compass rose is primarily composed of four cardinal directions—north, east, south, and west—each separated by 90 degrees, and secondarily divided by four ordinal (intercardinal) directions—northeast, southeast, southwest, and ...

  4. Peter Gustav Lejeune Dirichlet - Wikipedia

    en.wikipedia.org/wiki/Peter_Gustav_Lejeune_Dirichlet

    Dirichlet also lectured on probability theory and least squares, introducing some original methods and results, in particular for limit theorems and an improvement of Laplace's method of approximation related to the central limit theorem. [21] The Dirichlet distribution and the Dirichlet process, based on the Dirichlet integral, are named after ...

  5. Cardinal direction - Wikipedia

    en.wikipedia.org/wiki/Cardinal_direction

    The four cardinal directions, or cardinal points, are the four main compass directions: north, south, east, and west, commonly denoted by their initials N, S, E, and W respectively. Relative to north, the directions east, south, and west are at 90 degree intervals in the clockwise direction.

  6. Direction determination - Wikipedia

    en.wikipedia.org/wiki/Direction_determination

    Direction determination refers to the ways in which a cardinal direction or compass point can be determined in navigation and wayfinding. The most direct method is using a compass (magnetic compass or gyrocompass), but indirect methods exist, based on the Sun path (unaided or by using a watch or sundial), the stars, and satellite navigation. [1]

  7. Compass rose - Wikipedia

    en.wikipedia.org/wiki/Compass_rose

    Linguistic anthropological studies have shown that most human communities have four points of cardinal direction.The names given to these directions are usually derived from either locally-specific geographic features (e.g. "towards the hills", "towards the sea") or from celestial bodies (especially the sun) or from atmospheric features (winds, temperature). [1]

  8. Karnaugh map - Wikipedia

    en.wikipedia.org/wiki/Karnaugh_map

    A is the same and is equal to 1 throughout the box, therefore it should be included in the algebraic representation of the red minterm. B does not maintain the same state (it shifts from 1 to 0), and should therefore be excluded. C does not change. It is always 0, so its complement, NOT-C, should be included. Thus, C should be included.

  9. Hilbert's problems - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_problems

    Is a b transcendental, for algebraic a ≠ 0,1 and irrational algebraic b ? Resolved. Result: Yes, illustrated by the Gelfond–Schneider theorem. 1934 8th: The Riemann hypothesis ("the real part of any non-trivial zero of the Riemann zeta function is 1/2") and other prime-number problems, among them Goldbach's conjecture and the twin prime ...