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Exponential Integral

Function: double gsl_sf_expint_E1 (double x)
Function: int gsl_sf_expint_E1_e (double x, gsl_sf_result * result)
These routines compute the exponential integral @math{E_1(x)},

Function: double gsl_sf_expint_E2 (double x)
Function: int gsl_sf_expint_E2_e (double x, gsl_sf_result * result)
These routines compute the second-order exponential integral @math{E_2(x)},


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