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  2. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    The user may estimate the location of the decimal point in the result by mentally interpolating between labeled graduations. Scientific notation is used to track the decimal point for more precise calculations. Addition and subtraction steps in a calculation are generally done mentally or on paper, not on the slide rule.

  3. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    It adopts the form of the upper deck one bead and the bottom four beads. The top bead on the upper deck was equal to five and the bottom one is similar to the Chinese or Korean abacus, and the decimal number can be expressed, so the abacus is designed as a 1:4 device. The beads are always in the shape of a diamond.

  4. Diamond cubic - Wikipedia

    en.wikipedia.org/wiki/Diamond_cubic

    Rotating model of the diamond cubic crystal structure 3D ball-and-stick model of a diamond lattice Pole figure in stereographic projection of the diamond lattice showing the 3-fold symmetry along the [111] direction. In crystallography, the diamond cubic crystal structure is a repeating pattern of 8 atoms that certain materials may adopt as ...

  5. Methods of computing square roots - Wikipedia

    en.wikipedia.org/wiki/Methods_of_computing...

    Write the original number in decimal form. The numbers are written similar to the long division algorithm, and, as in long division, the root will be written on the line above. Now separate the digits into pairs, starting from the decimal point and going both left and right. The decimal point of the root will be above the decimal point of the ...

  6. Pell's equation - Wikipedia

    en.wikipedia.org/wiki/Pell's_equation

    The resulting algorithm for solving Pell's equation is more efficient than the continued fraction method, though it still takes more than polynomial time. Under the assumption of the generalized Riemann hypothesis , it can be shown to take time exp ⁡ O ( log ⁡ N ⋅ log ⁡ log ⁡ N ) , {\displaystyle \exp O\left({\sqrt {\log N\cdot \log ...

  7. Lattice multiplication - Wikipedia

    en.wikipedia.org/wiki/Lattice_multiplication

    To find the position of the decimal point in the final answer, one can draw a vertical line from the decimal point in 5.8, and a horizontal line from the decimal point in 2.13. (See picture for Step 4.) The grid diagonal through the intersection of these two lines then determines the position of the decimal point in the result. [2]

  8. Jamie Dimon says the 'Buffett Rule' approach to taxing the ...

    www.aol.com/jamie-dimon-says-buffett-rule...

    On PBS, Jamie Dimon described the Buffett Rule as a good idea for clamping down on US debt. It says richer households shouldn't pay taxes on a smaller share of income than middle-class ones.

  9. Stepped reckoner - Wikipedia

    en.wikipedia.org/wiki/Stepped_reckoner

    It was the first calculator that could perform all four basic arithmetic operations. [ 3 ] Its intricate precision gearwork, however, was somewhat beyond the fabrication technology of the time; mechanical problems, in addition to a design flaw in the carry mechanism, prevented the machines from working reliably.