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  2. Square thread form - Wikipedia

    en.wikipedia.org/wiki/Square_thread_form

    Square threads are defined as follows by ISO standards: . where Sq designates a square thread, 60 is the nominal diameter in millimeters, and 9 is the pitch in millimeters. When there is no suffix it is a single start thread.

  3. Simplification - Wikipedia

    en.wikipedia.org/wiki/Simplification

    Simplification is the process of replacing a mathematical expression by an equivalent one that is simpler (usually shorter), according to a well-founded ordering. Examples include:

  4. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.

  5. 1/4 + 1/16 + 1/64 + 1/256 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1/4_%2B_1/16_%2B_1/64_%2B...

    Today, a more standard phrasing of Archimedes' proposition is that the partial sums of the series 1 + ⁠ 1 / 4 ⁠ + ⁠ 1 / 16 ⁠ + ⋯ are: + + + + = +. This form can be proved by multiplying both sides by 1 − ⁠ 1 / 4 ⁠ and observing that all but the first and the last of the terms on the left-hand side of the equation cancel in pairs.

  6. 16 mm scale - Wikipedia

    en.wikipedia.org/wiki/16_mm_scale

    16 mm to 1 foot or 1:19.05 is a popular scale of model railway in the UK which represents narrow gauge prototypes. [1] The most common gauge for such railways is 32 mm ( 1.26 in ), representing 2 ft ( 610 mm ) gauge prototypes.

  7. Design of plastic components - Wikipedia

    en.wikipedia.org/wiki/Design_of_plastic_components

    Some plastics are more sensitive to wall thickness than others, where acetal and ABS plastics max out at around 0.12 in. thick (3 mm), acrylic can go to 0.5 in. (12 mm), polyurethane to 0.75 in. (18 mm), and certain fiber-reinforced plastics to 1 in. (25 mm) or more.

  8. Binomial coefficient - Wikipedia

    en.wikipedia.org/wiki/Binomial_coefficient

    As there is zero X n+1 or X −1 in (1 + X) n, one might extend the definition beyond the above boundaries to include () = when either k > n or k < 0. This recursive formula then allows the construction of Pascal's triangle , surrounded by white spaces where the zeros, or the trivial coefficients, would be.

  9. 4 mm - Wikipedia

    en.wikipedia.org/wiki/4_mm

    4 mm may refer to: 4 mm caliber , gun cartridges between 4–5 mm diameter 4 mm scale , in rail transport modelling, 1:76.2 scale with rails 16.5 mm apart, representing standard gauge in Britain