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diff --git a/src/c/elementaryFunctions/includes/lnp1m1.h b/src/c/elementaryFunctions/includes/lnp1m1.h
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+/*
+ *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+ *  Copyright (C) 2007-2008 - INRIA - Bruno JOFRET
+ *
+ *  This file must be used under the terms of the CeCILL.
+ *  This source file is licensed as described in the file COPYING, which
+ *  you should have received as part of this distribution.  The terms
+ *  are also available at
+ *  http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
+ *
+ */
+
+#ifndef __LNP1M1_H__
+#define __LNP1M1_H__
+
+#include "dynlib_elementaryfunctions.h"
+#include "floatComplex.h"
+#include "doubleComplex.h"
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+/*
+** Compute v = log ( (1 + s)/(1 - s) ) for different types .
+*/
+
+/*
+** \brief Float Lnp1m1 function
+** \param in : input value.
+*/
+EXTERN_ELEMFUNCT float		slnp1m1s(float in);
+
+/*
+** \brief Double Lnp1m1 function
+** \param in : input value.
+*/
+EXTERN_ELEMFUNCT double		dlnp1m1s(double in);
+
+
+#ifdef  __cplusplus
+} /* extern "C" */
+#endif
+
+
+#endif /* !__LNP1M1_H__ */
+