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  2. Pencil (geometry) - Wikipedia

    en.wikipedia.org/wiki/Pencil_(geometry)

    Some lines in the pencil through A. In geometry, a pencil is a family of geometric objects with a common property, for example the set of lines that pass through a given point in a plane, or the set of circles that pass through two given points in a plane.

  3. Silverpoint - Wikipedia

    en.wikipedia.org/wiki/Silverpoint

    Not blunting as easily as lead or tin, and rendering precise detail, silverpoint was especially favored in Florentine and Flemish workshops. Silverpoint drawings of this era include model books and preparatory sheets for paintings. Artists who worked in silverpoint include Jan van Eyck, Leonardo da Vinci, Albrecht Dürer and Raphael.

  4. Hilbert's axioms - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_axioms

    To a system of points, straight lines, and planes, it is impossible to add other elements in such a manner that the system thus generalized shall form a new geometry obeying all of the five groups of axioms. In other words, the elements of geometry form a system which is not susceptible of extension, if we regard the five groups of axioms as valid.

  5. Foundations of geometry - Wikipedia

    en.wikipedia.org/wiki/Foundations_of_geometry

    Absolute geometry is a geometry based on an axiom system consisting of all the axioms giving Euclidean geometry except for the parallel postulate or any of its alternatives. [69] The term was introduced by János Bolyai in 1832. [70] It is sometimes referred to as neutral geometry, [71] as it is neutral with respect to the parallel postulate.

  6. Technical drawing tool - Wikipedia

    en.wikipedia.org/wiki/Technical_drawing_tool

    The pen has an ink container which contains a metal tube, inside which is a thin metal needle or wire, the soul. Ink is absorbed between the needle and the tube wall, preventing an excessive amount of ink from being released. The needle has a weight and by waving the pen back and forth the needle is released and the ink can run.

  7. This is the surprising reason your pen caps have holes in them

    www.aol.com/news/2016-05-09-did-you-know-the...

    Turns out, there's a much more heroic answer behind it all. ... As explained on the FAQ section of their website, Bic claims, "In addition to help prevent the pen from leaking, ...

  8. Sprouts (game) - Wikipedia

    en.wikipedia.org/wiki/Sprouts_(game)

    Sprouts is an impartial paper-and-pencil game which can be analyzed for its mathematical properties. It was invented by mathematicians John Horton Conway and Michael S. Paterson [1] at Cambridge University in the early 1960s.

  9. Doctor pens book that claims to reveal 'rare details of heaven'

    www.aol.com/news/2016-08-22-doctor-pens-book...

    A new book claims to detail a doctor’s journey to the afterlife after a near-death experience led to a “spiritual awakening” that transformed his career. Doctor pens book that claims to ...

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