William Brouncker, 2nd Viscount Brouncker (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "William Brouncker, 2nd Viscount Brouncker" in English language version.

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biodiversityheritagelibrary.org

books.google.com

  • John Wallis, Arithmetica Infinitorum, ... (Oxford, England: Leon Lichfield, 1656), page 182. Brouncker expressed, as a continued fraction, the ratio of the area of a circle to the area of the circumscribed square (i.e., 4/π). The continued fraction appears at the top of page 182 (roughly) as: ☐ = 1 1/2 9/2 25/2 49/2 81/2 &c , where the square denotes the ratio that is sought. (Note: On the preceding page, Wallis names Brouncker as: "Dom. Guliel. Vicecon, & Barone Brouncher" (Lord William Viscount and Baron Brouncker).)

thegazette.co.uk

  • "No. 1485". The London Gazette. 9 February 1679. p. 2.