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  2. Publisher Item Identifier - Wikipedia

    en.wikipedia.org/wiki/Publisher_Item_Identifier

    The Publisher Item Identifier (PII) is a unique identifier used by a number of scientific journal publishers to identify documents. [1] It uses the pre-existing ISSN or ISBN of the publication in question, and adds a character for source publication type, an item number, and a check digit.

  3. 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.

  4. 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.

  5. Euler's totient function - Wikipedia

    en.wikipedia.org/wiki/Euler's_totient_function

    Thus, it is often called Euler's phi function or simply the phi function. In 1879, J. J. Sylvester coined the term totient for this function, [14] [15] so it is also referred to as Euler's totient function, the Euler totient, or Euler's totient. [16] Jordan's totient is a generalization of Euler's. The cototient of n is defined as n − φ(n).

  6. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    where C is the circumference of a circle, d is the diameter, and r is the radius.More generally, = where L and w are, respectively, the perimeter and the width of any curve of constant width.

  7. Proof that π is irrational - Wikipedia

    en.wikipedia.org/wiki/Proof_that_π_is_irrational

    Claim 1: + is an integer. Proof: Expanding f {\displaystyle f} as a sum of monomials, the coefficient of x k {\displaystyle x^{k}} is a number of the form c k / n ! {\displaystyle c_{k}/n!} where c k {\displaystyle c_{k}} is an integer, which is 0 {\displaystyle 0} if k < n . {\displaystyle k<n.}

  8. List of academic publishers by preprint policy - Wikipedia

    en.wikipedia.org/wiki/List_of_academic...

    the preprint should not have been formally peer reviewed Publishers may place additional restrictions (e.g. specifying non-commercial servers or preferred licenses). Most publishers have a unified policy across all of their journals, however some journals list exceptions in their own policies.

  9. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    Consider all cells (x, y) in which both x and y are integers between − r and r. Starting at 0, add 1 for each cell whose distance to the origin (0, 0) is less than or equal to r. When finished, divide the sum, representing the area of a circle of radius r, by r 2 to find the approximation of π. For example, if r is 5, then the cells ...