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  2. Euler's totient function - Wikipedia

    en.wikipedia.org/wiki/Euler's_totient_function

    Leonhard Euler introduced the function in 1763. [7] [8] [9] However, he did not at that time choose any specific symbol to denote it.In a 1784 publication, Euler studied the function further, choosing the Greek letter π to denote it: he wrote πD for "the multitude of numbers less than D, and which have no common divisor with it". [10]

  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. Outline (list) - Wikipedia

    en.wikipedia.org/wiki/Outline_(list)

    An integrated outline is a helpful step in the process of organizing and writing a scholarly paper (literature review, research paper, thesis or dissertation). When completed the integrated outline contains the relevant scholarly sources (author's last name, publication year, page number if quote) for each section in the outline.

  5. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    The golden ratio is also apparent in the organization of the sections in the music of Debussy's Reflets dans l'eau (Reflections in water), from Images (1st series, 1905), in which "the sequence of keys is marked out by the intervals 34, 21, 13 and 8, and the main climax sits at the phi position".

  6. Proof that π is irrational - Wikipedia

    en.wikipedia.org/wiki/Proof_that_π_is_irrational

    On the other hand, the limit of this quantity as goes to infinity is zero, and so, if is large enough, < Thereby, a contradiction is reached. Hermite did not present his proof as an end in itself but as an afterthought within his search for a proof of the transcendence of π . {\displaystyle \pi .}

  7. Proof that 22/7 exceeds π - Wikipedia

    en.wikipedia.org/wiki/Proof_that_22/7_exceeds_π

    The purpose of the proof is not primarily to convince its readers that ⁠ 22 / 7 ⁠ (or ⁠3 + 1 / 7 ⁠) is indeed bigger than π. Systematic methods of computing the value of π exist. If one knows that π is approximately 3.14159, then it trivially follows that π < ⁠ 22 / 7 ⁠, which is approximately 3.142857.

  8. Chronology of computation of π - Wikipedia

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

    The last 100 decimal digits of the latest world record computation are: [1] 7034341087 5351110672 0525610978 1945263024 9604509887 5683914937 4658179610 2004394122 9823988073 3622511852 Graph showing how the record precision of numerical approximations to pi measured in decimal places (depicted on a logarithmic scale), evolved in human history.

  9. Outline of scientific method - Wikipedia

    en.wikipedia.org/wiki/Outline_of_scientific_method

    The following outline is provided as an overview of and topical guide to the scientific method: . Scientific method – body of techniques for investigating phenomena and acquiring new knowledge, as well as for correcting and integrating previous knowledge.