diff --git a/include/Algo/Topo/simplex.h b/include/Algo/Topo/simplex.h
new file mode 100644
index 0000000000000000000000000000000000000000..ed155d4a94a461d7fad90729ab199e3d250ef2a4
--- /dev/null
+++ b/include/Algo/Topo/simplex.h
@@ -0,0 +1,87 @@
+/*******************************************************************************
+* CGoGN: Combinatorial and Geometric modeling with Generic N-dimensional Maps  *
+* version 0.1                                                                  *
+* Copyright (C) 2009-2012, IGG Team, LSIIT, University of Strasbourg           *
+*                                                                              *
+* This library is free software; you can redistribute it and/or modify it      *
+* under the terms of the GNU Lesser General Public License as published by the *
+* Free Software Foundation; either version 2.1 of the License, or (at your     *
+* option) any later version.                                                   *
+*                                                                              *
+* This library 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 Lesser General Public License  *
+* for more details.                                                            *
+*                                                                              *
+* You should have received a copy of the GNU Lesser General Public License     *
+* along with this library; if not, write to the Free Software Foundation,      *
+* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.           *
+*                                                                              *
+* Web site: http://cgogn.unistra.fr/                                           *
+* Contact information: cgogn@unistra.fr                                        *
+*                                                                              *
+*******************************************************************************/
+
+
+#ifndef __SIMPLEX__
+#define __SIMPLEX__
+
+#include "Topology/generic/cells.h"
+
+namespace CGoGN
+{
+
+namespace Algo
+{
+
+namespace Topo
+{
+
+
+template <typename MAP, unsigned int ORBIT>
+bool isSimplex(const MAP& map, Dart d)
+{
+	if (ORBIT==VOLUME)
+	{
+		Dart d1 = map.phi2(d);
+		Dart e = map.phi1(d);
+		Dart d2 = map.phi2(e);
+		e = map.phi1(e);
+		Dart d3 = map.phi2(d);
+
+		if (map.phi1(e) != d)  // check that face of d is a triangle
+			return false;
+
+		if (map.phi_1(d1) != map.template phi<12>(d2))
+			return false;
+		if (map.phi_1(d2) != map.template phi<12>(d3))
+			return false;
+		if (map.phi_1(d3) != map.template phi<12>(d1))
+			return false;
+
+		if (! map.isCycleTriangle(d1))
+			return false;
+		if (! map.isCycleTriangle(d2))
+			return false;
+		if (! map.isCycleTriangle(d3))
+			return false;
+
+		return true;
+	}
+	if (ORBIT==FACE)
+	{
+		return map.isCycleTriangle(d);
+	}
+
+	return true;
+}
+
+
+} // namespace Topo
+
+} // namespace Algo
+
+} // namespace CGoGN
+
+
+#endif
diff --git a/include/Topology/generic/simplices.h b/include/Topology/generic/simplices.h
index 636b291d72013d72af24f70abc3da7eaf95e6bab..e51c62ae1d6b3a40f13a89be1c6a0e1f996092ee 100644
--- a/include/Topology/generic/simplices.h
+++ b/include/Topology/generic/simplices.h
@@ -27,7 +27,7 @@
 
 #include <iostream>
 #include "cells.h"
-#include "Algo/Topo/Generic/simplex.h"
+#include "Algo/Topo/simplex.h"
 
 namespace CGoGN
 {