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diff --git a/src/auxiliaryFunctions/includes/isnan.h b/src/auxiliaryFunctions/includes/isnan.h
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+++ b/src/auxiliaryFunctions/includes/isnan.h
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+/*
+**  -*- C -*-
+**
+** isnan.h
+** Made by  Bruno JOFRET <bruno.jofret@inria.fr>
+**
+** Started on  Thu Feb  8 10:12:17 2007 jofret
+** Last update Thu Apr 26 17:10:23 2007 jofret
+**
+** Copyright INRIA 2007
+*/
+
+#ifndef __IS_NAN_H__
+#define __IS_NAN_H__
+
+#include <stdbool.h>
+#include <math.h>
+
+#include "floatComplex.h"
+#include "doubleComplex.h"
+
+/*
+** \brief Float Is Nan function
+*/
+bool	sisnans(float x);
+
+/*
+** \brief Double Is Nan function
+*/
+bool	disnans(double x);
+
+/*
+** \brief Float Complex Is Nan function
+*/
+bool	cisnans(floatComplex z);
+
+/*
+** \brief Double Complex Is Nan function
+*/
+bool	zisnans(doubleComplex z);
+#endif /* !__IS_NAN_H__ */