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  2. Programme identification - Wikipedia

    en.wikipedia.org/wiki/Programme_identification

    The PI code allows the radio to identify the station across different broadcast relay stations. This in turn allows listeners to stay tuned to a network whilst travelling across the service area of multiple transmitters. The PI code is a 4-digit hexadecimal number. For example BBC Radio 1 has PI code C201. (The number itself is usually not ...

  3. Proof that π is irrational - Wikipedia

    en.wikipedia.org/wiki/Proof_that_π_is_irrational

    Conclusion: Since () > and ⁡ > for < < (because is the smallest positive zero of the sine function), Claims 1 and 2 show that () + is a positive integer. Since 0 ≤ x ( a − b x ) ≤ π a {\displaystyle 0\leq x(a-bx)\leq \pi a} and 0 ≤ sin ⁡ x ≤ 1 {\displaystyle 0\leq \sin x\leq 1} for 0 ≤ x ≤ π , {\displaystyle 0\leq x\leq \pi ...

  4. A History of Pi - Wikipedia

    en.wikipedia.org/wiki/A_History_of_Pi

    A History of Pi was originally published as A History of π in 1970 by Golem Press. This edition did not cover any approximations of π calculated after 1946. A second edition, printed in 1971, added material on the calculation of π by electronic computers, but still contained historical and mathematical errors, such as an incorrect proof that there exist infinitely many prime numbers. [4]

  5. Gauss–Legendre algorithm - Wikipedia

    en.wikipedia.org/wiki/Gauss–Legendre_algorithm

    The Gauss–Legendre algorithm is an algorithm to compute the digits of π.It is notable for being rapidly convergent, with only 25 iterations producing 45 million correct digits of π.

  6. 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 .

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

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

    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 ...

  8. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    Super PI by Kanada Laboratory [99] in the University of Tokyo is the program for Microsoft Windows for runs from 16,000 to 33,550,000 digits. It can compute one million digits in 40 minutes, two million digits in 90 minutes and four million digits in 220 minutes on a Pentium 90 MHz. Super PI version 1.9 is available from Super PI 1.9 page.

  9. Bailey–Borwein–Plouffe formula - Wikipedia

    en.wikipedia.org/wiki/Bailey–Borwein–Plouffe...

    Richard J. Lipton, "Cook’s Class Contains Pi", weblog post, March 15, 2009. Bailey, David H. "A compendium of BBP-type formulas for mathematical constants, updated 15 Aug 2017" (PDF) David H. Bailey, "BBP Code Directory", web page with links to Bailey's code implementing the BBP algorithm, September 8, 2006.