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Date: 21-9-2018
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Date: 12-10-2018
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Date: 18-8-2019
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The regularized gamma functions are defined by
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(1) |
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(2) |
where and
are incomplete gamma functions and
is a complete gamma function. The function
is implemented in the Wolfram Language as GammaRegularized[a, 0, z], and
is implemented as GammaRegularized[a, z].
and
satisfy the identity
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(3) |
The derivatives of and
are
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(4) |
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(5) |
and the second derivatives are
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(6) |
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(7) |
The integrals are
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(8) |
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(9) |
REFERENCES:
Press, W. H.; Flannery, B. P.; Teukolsky, S. A.; and Vetterling, W. T. Numerical Recipes in FORTRAN: The Art of Scientific Computing, 2nd ed. Cambridge, England: Cambridge University Press, pp. 160-161, 1992.
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