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diff --git a/gsl-1.9/specfunc/gsl_sf_exp.h b/gsl-1.9/specfunc/gsl_sf_exp.h
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+/* specfunc/gsl_sf_exp.h
+ * 
+ * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2004 Gerard Jungman
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/* Author:  G. Jungman */
+
+#ifndef __GSL_SF_EXP_H__
+#define __GSL_SF_EXP_H__
+
+#include <gsl/gsl_sf_result.h>
+#include <gsl/gsl_precision.h>
+
+#undef __BEGIN_DECLS
+#undef __END_DECLS
+#ifdef __cplusplus
+# define __BEGIN_DECLS extern "C" {
+# define __END_DECLS }
+#else
+# define __BEGIN_DECLS /* empty */
+# define __END_DECLS /* empty */
+#endif
+
+__BEGIN_DECLS
+
+/* Provide an exp() function with GSL semantics,
+ * i.e. with proper error checking, etc.
+ *
+ * exceptions: GSL_EOVRFLW, GSL_EUNDRFLW
+ */
+int gsl_sf_exp_e(const double x, gsl_sf_result * result);
+double gsl_sf_exp(const double x);
+
+
+/* Exp(x)
+ *
+ * exceptions: GSL_EOVRFLW, GSL_EUNDRFLW
+ */
+int gsl_sf_exp_e10_e(const double x, gsl_sf_result_e10 * result);
+
+
+/* Exponentiate and multiply by a given factor:  y * Exp(x)
+ *
+ * exceptions: GSL_EOVRFLW, GSL_EUNDRFLW
+ */
+int gsl_sf_exp_mult_e(const double x, const double y, gsl_sf_result * result);
+double gsl_sf_exp_mult(const double x, const double y);
+
+
+/* Exponentiate and multiply by a given factor:  y * Exp(x)
+ *
+ * exceptions: GSL_EOVRFLW, GSL_EUNDRFLW
+ */
+int gsl_sf_exp_mult_e10_e(const double x, const double y, gsl_sf_result_e10 * result);
+
+
+/* exp(x)-1
+ *
+ * exceptions: GSL_EOVRFLW
+ */
+int gsl_sf_expm1_e(const double x, gsl_sf_result * result);
+double gsl_sf_expm1(const double x);
+
+
+/* (exp(x)-1)/x = 1 + x/2 + x^2/(2*3) + x^3/(2*3*4) + ...
+ *
+ * exceptions: GSL_EOVRFLW
+ */
+int gsl_sf_exprel_e(const double x, gsl_sf_result * result);
+double gsl_sf_exprel(const double x);
+
+
+/* 2(exp(x)-1-x)/x^2 = 1 + x/3 + x^2/(3*4) + x^3/(3*4*5) + ...
+ *
+ * exceptions: GSL_EOVRFLW
+ */
+int gsl_sf_exprel_2_e(double x, gsl_sf_result * result);
+double gsl_sf_exprel_2(const double x);
+
+
+/* Similarly for the N-th generalization of
+ * the above. The so-called N-relative exponential
+ *
+ * exprel_N(x) = N!/x^N (exp(x) - Sum[x^k/k!, {k,0,N-1}])
+ *             = 1 + x/(N+1) + x^2/((N+1)(N+2)) + ...
+ *             = 1F1(1,1+N,x)
+ */
+int gsl_sf_exprel_n_e(const int n, const double x, gsl_sf_result * result);
+double gsl_sf_exprel_n(const int n, const double x);
+
+
+/* Exponentiate a quantity with an associated error.
+ */
+int gsl_sf_exp_err_e(const double x, const double dx, gsl_sf_result * result);
+
+/* Exponentiate a quantity with an associated error.
+ */
+int gsl_sf_exp_err_e10_e(const double x, const double dx, gsl_sf_result_e10 * result);
+
+
+/* Exponentiate and multiply by a given factor:  y * Exp(x),
+ * for quantities with associated errors.
+ *
+ * exceptions: GSL_EOVRFLW, GSL_EUNDRFLW
+ */
+int gsl_sf_exp_mult_err_e(const double x, const double dx, const double y, const double dy, gsl_sf_result * result);
+
+
+/* Exponentiate and multiply by a given factor:  y * Exp(x),
+ * for quantities with associated errors.
+ *
+ * exceptions: GSL_EOVRFLW, GSL_EUNDRFLW
+ */
+int gsl_sf_exp_mult_err_e10_e(const double x, const double dx, const double y, const double dy, gsl_sf_result_e10 * result);
+
+__END_DECLS
+
+#endif /* __GSL_SF_EXP_H__ */