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diff --git a/matching/include/phat/representations/vector_set.h b/matching/include/phat/representations/vector_set.h
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+++ b/matching/include/phat/representations/vector_set.h
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+/*  Copyright 2013 IST Austria
+    Contributed by: Ulrich Bauer, Michael Kerber, Jan Reininghaus
+
+    This file is part of PHAT.
+
+    PHAT 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 3 of the License, or
+    (at your option) any later version.
+
+    PHAT 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 PHAT.  If not, see <http://www.gnu.org/licenses/>. */
+
+#pragma once
+
+#include <phat/helpers/misc.h>
+
+namespace phat {
+    class vector_set {
+
+    protected:
+        std::vector< dimension > dims;
+        std::vector< std::set< index > > matrix;
+
+    public:
+        // overall number of cells in boundary_matrix
+        index _get_num_cols() const {
+            return (index)matrix.size(); 
+        }
+        void _set_num_cols( index nr_of_columns ) {
+            dims.resize( nr_of_columns );
+            matrix.resize( nr_of_columns );
+        }
+
+         // dimension of given index
+        dimension _get_dim( index idx ) const { 
+            return dims[ idx ]; 
+        }
+        void _set_dim( index idx, dimension dim ) { 
+            dims[ idx ] = dim; 
+        }
+
+        // replaces(!) content of 'col' with boundary of given index
+        void _get_col( index idx, column& col  ) const {
+            col.clear();
+            col.reserve( matrix[idx].size() );
+            std::copy (matrix[idx].begin(), matrix[idx].end(), std::back_inserter(col) );
+        }
+        void _set_col( index idx, const column& col  ) {
+            matrix[ idx ].clear();
+            matrix[ idx ].insert( col.begin(), col.end() );
+        }
+
+        // true iff boundary of given idx is empty
+        bool _is_empty( index idx ) const {
+            return matrix[ idx ].empty();    
+        }
+
+        // largest row index of given column idx (new name for lowestOne())
+        index _get_max_index( index idx ) const {
+            return matrix[ idx ].empty() ? -1 : *matrix[ idx ].rbegin();
+        }
+
+        // removes the maximal index of a column
+        void _remove_max( index idx ) {
+            std::set< index >::iterator it = matrix[ idx ].end();
+            it--;
+            matrix[ idx ].erase( it );
+        }
+        
+        // clears given column
+        void _clear( index idx ) {
+            matrix[ idx ].clear();    
+        }
+
+        // syncronizes all data structures (essential for openmp stuff)
+        void _sync() {}
+
+        // adds column 'source' to column 'target'
+        void _add_to( index source, index target ) {
+            for( std::set< index >::iterator it = matrix[ source ].begin(); it != matrix[ source ].end(); it++ ) {
+				std::set< index >& col = matrix[ target ];
+				std::pair< std::set< index >::iterator, bool > result = col.insert( *it );
+				if( !result.second ) 
+					col.erase( result.first );
+			}
+        }
+        
+        // finalizes given column
+        void _finalize( index idx ) {
+        }
+
+    };
+}