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}
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}
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\source{
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\source{
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  \code{log1p} and \code{expm1} may be taken from the operating system,
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  \code{log1p} and \code{expm1} may be taken from the operating system,
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  but if not available there then they are based on the Fortran subroutine
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  but if not available there then they are based on the Fortran subroutine
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  \code{dlnrel} by W. Fullerton of Los Alamos Scientific Laboratory (see
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  \code{dlnrel} by W. Fullerton of Los Alamos Scientific Laboratory (see
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  \url{http://www.netlib.org/slatec/fnlib/dlnrel.f} and (for small x) a
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  \url{http://www.netlib.org/slatec/fnlib/dlnrel.f}) and (for small x) a
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  single Newton step for the solution of \code{log1p(y) = x}
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  single Newton step for the solution of \code{log1p(y) = x}
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  respectively.
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  respectively.
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}
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}
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\references{
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\references{
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)