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Date: 21-5-2019
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Date: 1-8-2019
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Date: 12-9-2019
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The q-analog of pi can be defined by setting
in the q-factorial
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(1) |
to obtain
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(2) |
where is Gosper's q-sine, so
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(3) |
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(4) |
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(5) |
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(6) |
(Gosper 2001).
It has the Maclaurin series
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(7) |
(OEIS A144874).
It is related to the q-analog of the Wallis formula (Gosper 2001), and has the special value
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(8) |
The area under is given by
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(9) |
(OEIS A144875).
Gosper has developed an iterative algorithm for computing based on the algebraic recurrence relation
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(10) |
REFERENCES:
Sloane, N. J. A. Sequences A144874 and A144875 in "The On-Line Encyclopedia of Integer Sequences."
Gosper, R. W. "Experiments and Discoveries in q-Trigonometry." In Symbolic Computation, Number Theory,Special Functions, Physics and Combinatorics. Proceedings of the Conference Held at the University of Florida, Gainesville, FL, November 11-13, 1999 (Ed. F. G. Garvan and M. E. H. Ismail). Dordrecht, Netherlands: Kluwer, pp. 79-105, 2001.
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