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  2. Euler's Disk - Wikipedia

    en.wikipedia.org/wiki/Euler's_Disk

    Euler's Disk, invented between 1987 and 1990 by Joseph Bendik, [1] is a trademarked scientific educational toy. [2] It is used to illustrate and study the dynamic system of a spinning and rolling disk on a flat or curved surface.

  3. Unit disk - Wikipedia

    en.wikipedia.org/wiki/Unit_disk

    In mathematics, the open unit disk (or disc) around P (where P is a given point in the plane), is the set of points whose distance from P is less than 1: = {: | | <}. The closed unit disk around P is the set of points whose distance from P is less than or equal to one:

  4. Slipmat - Wikipedia

    en.wikipedia.org/wiki/Slipmat

    A slipmat is a circular piece of slippery cloth or synthetic materials disk jockeys place on the turntable platter instead of the traditional rubber mat. Unlike the rubber mat which is made to hold the record firmly in sync with the rotating platter , slipmats are designed to slip on the platter, allowing the DJ to manipulate a record on a ...

  5. Biconcave disc - Wikipedia

    en.wikipedia.org/wiki/Biconcave_disc

    A biconcave disc. In geometry and mathematical biology, a biconcave disc — also referred to as a discocyte [1] — is a geometric shape resembling an oblate spheroid with two concavities on the top and on the bottom. Biconcave discs appear in the study of cell biology, as an approximation to the shape of certain cells, including red blood cells.

  6. Disc integration - Wikipedia

    en.wikipedia.org/wiki/Disc_integration

    Disc integration, also known in integral calculus as the disc method, is a method for calculating the volume of a solid of revolution of a solid-state material when integrating along an axis "parallel" to the axis of revolution. This method models the resulting three-dimensional shape as a stack of an infinite number of discs of varying radius ...

  7. Disk covering problem - Wikipedia

    en.wikipedia.org/wiki/Disk_covering_problem

    The disk covering problem asks for the smallest real number such that disks of radius () can be arranged in such a way as to cover the unit disk.Dually, for a given radius ε, one wishes to find the smallest integer n such that n disks of radius ε can cover the unit disk.

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