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  2. Chronology of computation of π - Wikipedia

    en.wikipedia.org/wiki/Chronology_of_computation...

    The first to use an electronic computer (the ENIAC) to calculate π [25] 70 hours 2,037: 1953: Kurt Mahler: Showed that π is not a Liouville number: 1954 S. C. Nicholson & J. Jeenel Using the NORC [26] 13 minutes 3,093: 1957 George E. Felton: Ferranti Pegasus computer (London), calculated 10,021 digits, but not all were correct [27] [28] 33 ...

  3. A Google employee broke the world record for calculating pi - AOL

    www.aol.com/2019-03-14-a-google-employee-broke...

    Google engineer Emma Haruka Iwao has calculated pi to 31 trillion digits, breaking the world record.

  4. Emma Haruka Iwao - Wikipedia

    en.wikipedia.org/wiki/Emma_Haruka_Iwao

    Emma Haruka Iwao (born April 21, 1984) is a Japanese computer scientist and cloud developer advocate at Google. [5] [6] In 2019 Haruka Iwao calculated the then world record for most accurate value of pi (π); which included 31.4 trillion digits, exceeding the previous record of 22 trillion.

  5. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    In 1789, the Slovene mathematician Jurij Vega improved John Machin's formula to calculate the first 140 digits, of which the first 126 were correct. [32] In 1841, William Rutherford calculated 208 digits, of which the first 152 were correct.

  6. Yasumasa Kanada - Wikipedia

    en.wikipedia.org/wiki/Yasumasa_Kanada

    From 2002 until 2009, Kanada held the world record calculating the number of digits in the decimal expansion of pi – exactly 1.2411 trillion digits. [1] The calculation took more than 600 hours on 64 nodes of a HITACHI SR8000/MPP supercomputer. Some of his competitors in recent years include Jonathan and Peter Borwein and the Chudnovsky brothers.

  7. Bryson of Heraclea - Wikipedia

    en.wikipedia.org/wiki/Bryson_of_Heraclea

    Bryson, along with his contemporary, Antiphon, was the first to inscribe a polygon inside a circle, find the polygon's area, double the number of sides of the polygon, and repeat the process, resulting in a lower bound approximation of the area of a circle. "Sooner or later (they figured), ...[there would be] so many sides that the polygon ...

  8. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    In 1844, a record was set by Zacharias Dase, who employed a Machin-like formula to calculate 200 decimals of π in his head at the behest of German mathematician Carl Friedrich Gauss. [88] In 1853, British mathematician William Shanks calculated π to 607 digits, but made a mistake in the 528th digit, rendering all subsequent digits incorrect ...

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

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

    Similar to PI, investors use NPV to determine whether a project is likely to add value to their portfolio. But, NPV assesses the absolute profitability of a project while PI is used to compare the ...

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