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  2. 1/2 + 1/4 + 1/8 + 1/16 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1/2_%2B_1/4_%2B_1/8_%2B_1/...

    1/2 + 1/4 + 1/8 + 1/16 + ⋯. First six summands drawn as portions of a square. The geometric series on the real line. In mathematics, the infinite series ⁠ 1 2 ⁠ + ⁠ 1 4 ⁠ + ⁠ 1 8 ⁠ + ⁠ 1 16 ⁠ + ··· is an elementary example of a geometric series that converges absolutely. The sum of the series is 1. In summation notation ...

  3. 1 − 2 + 4 − 8 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%E2%88%92_2_%2B_4_%E2%88...

    12 + 48 + ⋯. In mathematics, 12 + 48 + ⋯ is the infinite series whose terms are the successive powers of two with alternating signs. As a geometric series, it is characterized by its first term, 1, and its common ratio, −2. As a series of real numbers, it diverges. So in the usual sense it has no sum.

  4. 1/2 − 1/4 + 1/8 − 1/16 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1/2_%E2%88%92_1/4_%2B_1/8...

    1/21/4 + 1/81/16 + ⋯. In mathematics, the infinite series 1/21/4 + 1/81/16 + ⋯ is a simple example of an alternating series that converges absolutely . It is a geometric series whose first term is 1 2 and whose common ratio is − 1 2, so its sum is.

  5. Chuck (engineering) - Wikipedia

    en.wikipedia.org/wiki/Chuck_(engineering)

    A chuck is a specialized type of clamp used to hold an object with radial symmetry, especially a cylinder. In a drill, a mill and a transmission, a chuck holds the rotating tool; in a lathe, it holds the rotating workpiece. [1] Chucks commonly use jaws to hold the tool or workpiece. The jaws (sometimes called dogs) are typically arranged in a ...

  6. Drill bit shank - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_shank

    One particular type of reduced-shank drill bits are Silver & Deming (S&D) bits, whose sets run from 9 ⁄ 16-inch (14 mm) to 1 + 12-inch (38 mm) drill body diameter with a standard 12-inch (13 mm) reduced shank for all. This allows drill presses with 12-inch (13 mm) chucks to run the larger drills. S&D bits are 6 inches (150 mm ...

  7. Kolakoski sequence - Wikipedia

    en.wikipedia.org/wiki/Kolakoski_sequence

    In mathematics, the Kolakoski sequence, sometimes also known as the Oldenburger–Kolakoski sequence, [1] is an infinite sequence of symbols {1,2} that is the sequence of run lengths in its own run-length encoding. [2] It is named after the recreational mathematician William Kolakoski (1944–97) who described it in 1965, [3] but it was ...

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