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  2. Chudnovsky algorithm - Wikipedia

    en.wikipedia.org/wiki/Chudnovsky_algorithm

    The Chudnovsky algorithm is a fast method for calculating the digits of π, based on Ramanujan's π formulae.Published by the Chudnovsky brothers in 1988, [1] it was used to calculate π to a billion decimal places.

  3. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    The symbol means that the ratio of the left-hand side and the right-hand side tends to one as . The symbol ≃ {\displaystyle \simeq } means that the difference between the left-hand side and the right-hand side tends to zero as n → ∞ {\displaystyle n\to \infty } .

  4. Chudnovsky brothers - Wikipedia

    en.wikipedia.org/wiki/Chudnovsky_brothers

    David Volfovich Chudnovsky [a] (born January 22, 1947) and Gregory Volfovich Chudnovsky [b] (born April 17, 1952) are American mathematicians and engineers known for their world-record mathematical calculations and developing the Chudnovsky algorithm used to calculate the digits of π with extreme precision.

  5. Calculator input methods - Wikipedia

    en.wikipedia.org/wiki/Calculator_input_methods

    This printing calculator made by Sharp uses ten-key notation. Notice the size and placement of the keys, including the extra-large "+/=" and the red "-/=" keys. The ten-key notation input method first became popular with accountants' paper tape adding machines. It generally makes the assumption that entered numbers are being summed, although ...

  6. Machin-like formula - Wikipedia

    en.wikipedia.org/wiki/Machin-like_formula

    Let be the number of digits to which is to be calculated. Let N t {\displaystyle N_{t}} be the number of terms in the Taylor series (see equation 2 ). Let u n {\displaystyle u_{n}} be the amount of time spent on each digit (for each term in the Taylor series).

  7. Numeric keypad - Wikipedia

    en.wikipedia.org/wiki/Numeric_keypad

    When Num Lock is on, digit keys produce the corresponding digit. On Apple Macintosh computers, which lack a Num Lock key, the numeric keypad always produces only numbers; the Num Lock key is replaced by the Clear key. The arrangement of digits on numeric keypads with the 7-8-9 keys two rows above the 1-2-3 keys is derived from calculators and ...

  8. What’s the Profitability Index (PI) and How Is It Calculated?

    www.aol.com/profitability-index-pi-calculated...

    Essentially, the PI compares projected cash flows to the initial investment required. A PI greater than one suggests that the project is likely to generate more value than it costs, making it […]

  9. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics .

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    list of formulas using pimathematical constant in pi