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diff --git a/src/theory/unconstrained_simplifier.h b/src/theory/unconstrained_simplifier.h
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+/*********************                                                        */
+/*! \file unconstrained_simplifier.h
+ ** \verbatim
+ ** Original author: barrett
+ ** Major contributors: 
+ ** Minor contributors (to current version):
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010, 2011  The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief Simplifications based on unconstrained variables
+ **
+ ** This module implements a preprocessing phase which replaces certain "unconstrained" expressions
+ ** by variables.  Based on Roberto Bruttomesso's PhD thesis.
+ **/
+
+#include "cvc4_private.h"
+
+#ifndef __CVC4__UNCONSTRAINED_SIMPLIFIER_H
+#define __CVC4__UNCONSTRAINED_SIMPLIFIER_H
+
+#include <vector>
+#include <utility>
+
+#include "expr/node.h"
+#include "theory/theory.h"
+#include "theory/substitutions.h"
+
+namespace CVC4 {
+
+class UnconstrainedSimplifier {
+
+  /** number of expressions eliminated due to unconstrained simplification */
+  IntStat d_numUnconstrainedElim;
+
+  typedef std::hash_map<TNode, unsigned, TNodeHashFunction> TNodeCountMap;
+  typedef std::hash_map<TNode, TNode, TNodeHashFunction> TNodeMap;
+  typedef std::hash_set<TNode, TNodeHashFunction> TNodeSet;
+
+  TNodeCountMap d_visited;
+  TNodeMap d_visitedOnce;
+  TNodeSet d_unconstrained;
+
+  context::Context* d_context;
+  theory::SubstitutionMap d_substitutions;
+
+  const LogicInfo& d_logicInfo;
+
+  void visitAll(TNode assertion);
+  Node newUnconstrainedVar(TypeNode t, TNode var);
+  void processUnconstrained();
+  void removeExpr(TNode node);
+
+public:
+  UnconstrainedSimplifier(context::Context* context, const LogicInfo& logicInfo);
+  ~UnconstrainedSimplifier();
+  void processAssertions(std::vector<Node>& assertions);
+};
+
+}
+
+#endif