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  2. Photocopier - Wikipedia

    en.wikipedia.org/wiki/Photocopier

    Haloid called the new copier machines "Xerox Machines" and, in 1948, the term Xerox was trademarked. Haloid eventually became Xerox Corporation in 1961. In 1949, Xerox Corporation introduced the first xerographic copier, called the Model A. [ 3 ] Seeing off computing-leader IBM [ 4 ] in the office-copying market, Xerox became so successful that ...

  3. IEEE 754-1985 - Wikipedia

    en.wikipedia.org/wiki/IEEE_754-1985

    The positive and negative normalized numbers closest to zero (represented with the binary value 1 in the exponent field and 0 in the fraction field) are ±1 × 2 −126 ≈ ±1.17549 × 10 −38 The finite positive and finite negative numbers furthest from zero (represented by the value with 254 in the exponent field and all 1s in the fraction ...

  4. Duplicating machines - Wikipedia

    en.wikipedia.org/wiki/Duplicating_machines

    When spread over 20 or more copies, the cost per copy (2 to 4 cents) is close to photocopiers. But for every additional copy, the average cost decreases. At 100 prints, the master cost per copy was only 0.4–0.8 cents per copy, and the cost of the paper printed upon will start to dominate.

  5. Reciprocal rule - Wikipedia

    en.wikipedia.org/wiki/Reciprocal_rule

    The reciprocal rule can be used to show that the power rule holds for negative exponents if it has already been established for positive exponents. Also, one can readily deduce the quotient rule from the reciprocal rule and the product rule .

  6. Contact copier - Wikipedia

    en.wikipedia.org/wiki/Contact_copier

    A contact copier (also known as contact printer) is a device used to copy an image by illuminating a film negative with the image in direct contact with a photosensitive surface (film, paper, plate, etc.). The more common processes are negative, where clear areas in the original produce an opaque or hardened photosensitive surface, but positive ...

  7. Exponentiation - Wikipedia

    en.wikipedia.org/wiki/Exponentiation

    Raising 0 to a negative exponent is undefined but, in some circumstances, it may be interpreted as infinity (). [ 26 ] This definition of exponentiation with negative exponents is the only one that allows extending the identity b m + n = b m ⋅ b n {\displaystyle b^{m+n}=b^{m}\cdot b^{n}} to negative exponents (consider the case m = − n ...

  8. Floating-point arithmetic - Wikipedia

    en.wikipedia.org/wiki/Floating-point_arithmetic

    The sum of the exponent bias (127) and the exponent (1) is 128, so this is represented in the single-precision format as 0 10000000 10010010000111111011011 (excluding the hidden bit) = 40490FDB [27] as a hexadecimal number. An example of a layout for 32-bit floating point is and the 64-bit ("double") layout is similar.

  9. Ramanujan machine - Wikipedia

    en.wikipedia.org/wiki/Ramanujan_machine

    The Ramanujan machine is a specialised software package, developed by a team of scientists at the Technion: Israeli Institute of Technology, to discover new formulas in mathematics. It has been named after the Indian mathematician Srinivasa Ramanujan because it supposedly imitates the thought process of Ramanujan in his discovery of hundreds of ...

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