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diff --git a/gsl-1.9/specfunc/gsl_sf_zeta.h b/gsl-1.9/specfunc/gsl_sf_zeta.h
new file mode 100644
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+++ b/gsl-1.9/specfunc/gsl_sf_zeta.h
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+/* specfunc/gsl_sf_zeta.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_ZETA_H__
+#define __GSL_SF_ZETA_H__
+
+#include <gsl/gsl_sf_result.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
+
+
+/* Riemann Zeta Function
+ * zeta(n) = Sum[ k^(-n), {k,1,Infinity} ]
+ *
+ * n=integer, n != 1
+ * exceptions: GSL_EDOM, GSL_EOVRFLW
+ */
+int gsl_sf_zeta_int_e(const int n, gsl_sf_result * result);
+double gsl_sf_zeta_int(const int n);
+
+
+/* Riemann Zeta Function
+ * zeta(x) = Sum[ k^(-s), {k,1,Infinity} ], s != 1.0
+ *
+ * s != 1.0
+ * exceptions: GSL_EDOM, GSL_EOVRFLW
+ */
+int gsl_sf_zeta_e(const double s, gsl_sf_result * result);
+double gsl_sf_zeta(const double s);
+
+
+/* Riemann Zeta Function minus 1
+ *   useful for evaluating the fractional part
+ *   of Riemann zeta for large argument
+ *
+ * s != 1.0
+ * exceptions: GSL_EDOM, GSL_EOVRFLW
+ */
+int gsl_sf_zetam1_e(const double s, gsl_sf_result * result);
+double gsl_sf_zetam1(const double s);
+
+
+/* Riemann Zeta Function minus 1 for integer arg
+ *   useful for evaluating the fractional part
+ *   of Riemann zeta for large argument
+ *
+ * s != 1.0
+ * exceptions: GSL_EDOM, GSL_EOVRFLW
+ */
+int gsl_sf_zetam1_int_e(const int s, gsl_sf_result * result);
+double gsl_sf_zetam1_int(const int s);
+
+
+/* Hurwitz Zeta Function
+ * zeta(s,q) = Sum[ (k+q)^(-s), {k,0,Infinity} ]
+ *
+ * s > 1.0, q > 0.0
+ * exceptions: GSL_EDOM, GSL_EUNDRFLW, GSL_EOVRFLW
+ */
+int gsl_sf_hzeta_e(const double s, const double q, gsl_sf_result * result);
+double gsl_sf_hzeta(const double s, const double q);
+
+
+/* Eta Function
+ * eta(n) = (1-2^(1-n)) zeta(n)
+ *
+ * exceptions: GSL_EUNDRFLW, GSL_EOVRFLW
+ */
+int gsl_sf_eta_int_e(int n, gsl_sf_result * result);
+double gsl_sf_eta_int(const int n);
+
+
+/* Eta Function
+ * eta(s) = (1-2^(1-s)) zeta(s)
+ *
+ * exceptions: GSL_EUNDRFLW, GSL_EOVRFLW
+ */
+int gsl_sf_eta_e(const double s, gsl_sf_result * result);
+double gsl_sf_eta(const double s);
+
+
+__END_DECLS
+
+#endif /* __GSL_SF_ZETA_H__ */