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Date: 26-8-2020
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Ramanujan developed a number of interesting closed-form expressions for generalized continued fractions. These include the almost integers
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(OEIS A091667; Watson 1929, 1931; Hardy 1999, p. 8), where is the golden ratio, its multiplicative inverse
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(OEIS A091899; Ramanathan 1984), and
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(OEIS A091668; Watson 1929, 1931; Ramanathan 1984; Berndt and Rankin 1995, p. 57; Hardy 1999, p. 8) and its multiplicative inverse
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(OEIS A091900).
Other examples include the integrals
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(OEIS A091659; Preece 1931; Perron 1953; Berndt and Rankin 1995, pp. 57 and 65; Hardy 1999, p. 8), where is the Hurwitz zeta function and is the trigamma function, and
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(OEIS A091660; Preece 1931; Perron 1953; Berndt and Rankin 1995, pp. 57 and 65), where is a polygamma function.
REFERENCES:
Berndt, B. C. and Rankin, R. A. Ramanujan: Letters and Commentary. Providence, RI: Amer. Math. Soc., 1995.
Hardy, G. H. Ramanujan: Twelve Lectures on Subjects Suggested by His Life and Work, 3rd ed. New York: Chelsea, 1999.
Perron, O. "Über die Preeceschen Kettenbrüche." Sitz. Bayer. Akad. Wiss. München Math. Phys. Kl., 21-56, 1953.
Preece, C. T. "Theorems Stated by Ramanujan (X)." J. London Math. Soc. 6, 22-32, 1931.
Ramanathan, K. G. "On Ramanujan's Continued Fraction." Acta. Arith. 43, 209-226, 1984.
Sloane, N. J. A. Sequences A091659, A091660, A091667, A091668, A091899, and A091900 in "The On-Line Encyclopedia of Integer Sequences."
Watson, G. N. "Theorems Stated by Ramanujan (VII): Theorems on a Continued Fraction." J. London Math. Soc. 4, 39-48, 1929.
Watson, G. N. "Theorems Stated by Ramanujan (IX): Two Continued Fractions." J. London Math. Soc. 4, 231-237, 1929.
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دراسة يابانية لتقليل مخاطر أمراض المواليد منخفضي الوزن
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اكتشاف أكبر مرجان في العالم قبالة سواحل جزر سليمان
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المجمع العلمي ينظّم ندوة حوارية حول مفهوم العولمة الرقمية في بابل
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