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diff --git a/src/cython/gudhi/simplex_tree.pxd b/src/cython/gudhi/simplex_tree.pxd
new file mode 100644
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+++ b/src/cython/gudhi/simplex_tree.pxd
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+from cython cimport numeric
+from libcpp.vector cimport vector
+from libcpp.utility cimport pair
+from libcpp cimport bool
+from libcpp.string cimport string
+
+""" 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):       Vincent Rouvreau
+
+    Copyright (C) 2016 Inria
+
+    Modification(s):
+      - YYYY/MM Author: Description of the modification
+"""
+
+__author__ = "Vincent Rouvreau"
+__copyright__ = "Copyright (C) 2016 Inria"
+__license__ = "MIT"
+
+cdef extern from "Simplex_tree_interface.h" namespace "Gudhi":
+    cdef cppclass Simplex_tree_options_full_featured:
+        pass
+
+    cdef cppclass Simplex_tree_interface_full_featured "Gudhi::Simplex_tree_interface<Gudhi::Simplex_tree_options_full_featured>":
+        Simplex_tree()
+        double simplex_filtration(vector[int] simplex)
+        void assign_simplex_filtration(vector[int] simplex, double filtration)
+        void initialize_filtration()
+        int num_vertices()
+        int num_simplices()
+        void set_dimension(int dimension)
+        int dimension()
+        int upper_bound_dimension()
+        bool find_simplex(vector[int] simplex)
+        bool insert_simplex_and_subfaces(vector[int] simplex,
+                                         double filtration)
+        vector[pair[vector[int], double]] get_filtration()
+        vector[pair[vector[int], double]] get_skeleton(int dimension)
+        vector[pair[vector[int], double]] get_star(vector[int] simplex)
+        vector[pair[vector[int], double]] get_cofaces(vector[int] simplex,
+                                                          int dimension)
+        void expansion(int max_dim)
+        void remove_maximal_simplex(vector[int] simplex)
+        bool prune_above_filtration(double filtration)
+        bool make_filtration_non_decreasing()
+
+cdef extern from "Persistent_cohomology_interface.h" namespace "Gudhi":
+    cdef cppclass Simplex_tree_persistence_interface "Gudhi::Persistent_cohomology_interface<Gudhi::Simplex_tree<Gudhi::Simplex_tree_options_full_featured>>":
+        Simplex_tree_persistence_interface(Simplex_tree_interface_full_featured * st, bool persistence_dim_max)
+        vector[pair[int, pair[double, double]]] get_persistence(int homology_coeff_field, double min_persistence)
+        vector[int] betti_numbers()
+        vector[int] persistent_betti_numbers(double from_value, double to_value)
+        vector[pair[double,double]] intervals_in_dimension(int dimension)
+        void write_output_diagram(string diagram_file_name)
+        vector[pair[vector[int], vector[int]]] persistence_pairs()