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GNU Scientific Library Reference Manual - Third Edition (v1.12)
by M. Galassi, J. Davies, J. Theiler, B. Gough, G. Jungman, P. Alken, M. Booth, F. Rossi
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7.17.4 Ei_3(x)

Function: double gsl_sf_expint_3 (double x)
Function: int gsl_sf_expint_3_e (double x, gsl_sf_result * result)
These routines compute the third-order exponential integral Ei_3(x) = \int_0^xdt \exp(-t^3) for x >= 0.
ISBN 0954612078GNU Scientific Library Reference Manual - Third Edition (v1.12)See the print edition