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  (Abramowitz and Stegun section 6.1.1, page 255)
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  (Abramowitz and Stegun section 6.1.1, page 255)
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  \deqn{\Gamma(x) = \int_0^\infty t^{x-1} e^{-t} dt}{\Gamma(x) = integral_0^Inf t^(x-1) exp(-t) dt}
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  \deqn{\Gamma(x) = \int_0^\infty t^{x-1} e^{-t} dt}{\Gamma(x) = integral_0^Inf t^(x-1) exp(-t) dt}
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  for all real \code{x} except zero and negative integers (when
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  for all real \code{x} except zero and negative integers (when
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  \code{NaN} is returned).  There will be a warning on possible loss of
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  \code{NaN} is returned).  There will be a warning on possible loss of
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  precision for values which are too close (within about
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  precision for values which are too close (within about
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  \eqn{10^{-8}}{1e-8})) to a negative integer less than \samp{-10}.
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  \eqn{10^{-8}}{1e-8}) to a negative integer less than \samp{-10}.
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  \code{factorial(x)} (\eqn{x!} for non-negative integer \code{x})
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  \code{factorial(x)} (\eqn{x!} for non-negative integer \code{x})
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  is defined to be \code{gamma(x+1)} and \code{lfactorial} to be
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  is defined to be \code{gamma(x+1)} and \code{lfactorial} to be
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  \code{lgamma(x+1)}.
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  \code{lgamma(x+1)}.
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