A recovery of Brouncker's proof for the quadrature contunued fraction
- Autores: Sergey Khrushchev
- Localización: Publicacions matematiques, ISSN 0214-1493, Vol. 50, Nº 1, 2006, págs. 3-42
- Idioma: inglés
- Enlaces
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Resumen
350 years ago in Spring of 1655 Sir William Brouncker on a request by John Wallis obtained a beautiful continued fraction for 4/pi. Brouncker never published his proof. Many sources on the history of Mathematics claim that this proof was lost forever. In this paper we recover the original proof from Wallis' remarks presented in his "Arithmetica Infinitorum". We show that brouncker's and Walli's formulas can be extended to MacLaurin's sinusoidal spirals via related Euler's products. We derive Ramanujan's formula from Euler's formula and, by using it, tehn show that numerators of convergents of Brouncker's continued fractions coincide up to a rotation with Wilson's orthogonal plynomials corresponding to the parameters a=0, b=1/, c=d=1/4
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