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diff --git a/src/Persistent_cohomology/concept/PersistentHomology.h b/src/Persistent_cohomology/concept/PersistentHomology.h
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+/*    This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
+ *    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
+ *    Author(s):       Clément Maria
+ *
+ *    Copyright (C) 2014 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+/** \brief Concept describing the requirements for a class to compute 
+  * persistent homology. */
+struct PersistentHomology {
+
+/** \brief Type of filtered cell complex on which persistent homology
+  * is computed.
+  *
+  * Must be a model of concept FilteredComplex.
+  */
+  typedef unspecified Filtered_complex;
+
+/** \brief Type of coefficients to be used for computing persistent 
+  * homology.
+  *
+  * Must be a model of concept CoefficientField.
+  */
+  typedef unspecified Coefficient_field;
+
+ };