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diff --git a/src/util/integer_gmp_imp.h b/src/util/integer_gmp_imp.h
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+/*********************                                                        */
+/*! \file integer.h
+ ** \verbatim
+ ** Original author: taking
+ ** Major contributors: mdeters
+ ** Minor contributors (to current version): dejan, cconway
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010  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 A multiprecision integer constant.
+ **
+ ** A multiprecision integer constant.
+ **/
+
+#ifdef __CVC4__USE_GMP_IMP
+#include "cvc4_public.h"
+
+#ifndef __CVC4__INTEGER_H
+#define __CVC4__INTEGER_H
+
+#include <string>
+#include <iostream>
+#include "util/gmp_util.h"
+
+namespace CVC4 {
+
+class Rational;
+
+class Integer {
+private:
+  /**
+   * Stores the value of the rational is stored in a C++ GMP integer class.
+   * Using this instead of mpz_t allows for easier destruction.
+   */
+  mpz_class d_value;
+
+  /**
+   * Gets a reference to the gmp data that backs up the integer.
+   * Only accessible to friend classes.
+   */
+  const mpz_class& get_mpz() const { return d_value; }
+
+  /**
+   * Constructs an Integer by copying a GMP C++ primitive.
+   */
+  Integer(const mpz_class& val) : d_value(val) {}
+
+public:
+
+  /** Constructs a rational with the value 0. */
+  Integer() : d_value(0){}
+
+  /**
+   * Constructs a Integer from a C string.
+   * Throws std::invalid_argument if the string is not a valid rational.
+   * For more information about what is a valid rational string,
+   * see GMP's documentation for mpq_set_str().
+   */
+  explicit Integer(const char * s, int base = 10): d_value(s,base) {}
+  Integer(const std::string& s, unsigned base = 10) : d_value(s, base) {}
+
+  Integer(const Integer& q) : d_value(q.d_value) {}
+
+  Integer(  signed int z) : d_value(z) {}
+  Integer(unsigned int z) : d_value(z) {}
+  Integer(  signed long int z) : d_value(z) {}
+  Integer(unsigned long int z) : d_value(z) {}
+
+  ~Integer() {}
+
+
+  Integer& operator=(const Integer& x){
+    if(this == &x) return *this;
+    d_value = x.d_value;
+    return *this;
+  }
+
+  bool operator==(const Integer& y) const {
+    return d_value == y.d_value;
+  }
+
+  Integer operator-() const{
+    return Integer(-(d_value));
+  }
+
+
+  bool operator!=(const Integer& y) const {
+    return d_value != y.d_value;
+  }
+
+  bool operator< (const Integer& y) const {
+    return d_value < y.d_value;
+  }
+
+  bool operator<=(const Integer& y) const {
+    return d_value <= y.d_value;
+  }
+
+  bool operator> (const Integer& y) const {
+    return d_value > y.d_value;
+  }
+
+  bool operator>=(const Integer& y) const {
+    return d_value >= y.d_value;
+  }
+
+
+  Integer operator+(const Integer& y) const{
+    return Integer( d_value + y.d_value );
+  }
+
+  Integer operator-(const Integer& y) const {
+    return Integer( d_value - y.d_value );
+  }
+
+  Integer operator*(const Integer& y) const {
+    return Integer( d_value * y.d_value );
+  }
+  Integer operator/(const Integer& y) const {
+    return Integer( d_value / y.d_value );
+  }
+
+  /** Raise this Integer to the power <code>exp</code>.
+   *
+   * @param exp the exponent
+   */
+  Integer pow(unsigned long int exp) const {
+    mpz_class result;
+    mpz_pow_ui(result.get_mpz_t(),d_value.get_mpz_t(),exp);
+    return Integer( result );
+  }
+
+  std::string toString(int base = 10) const{
+    return d_value.get_str(base);
+  }
+
+  //friend std::ostream& operator<<(std::ostream& os, const Integer& n);
+
+  long getLong() const { return d_value.get_si(); }
+  unsigned long getUnsignedLong() const {return d_value.get_ui(); }
+
+  /**
+   * Computes the hash of the node from the first word of the
+   * numerator, the denominator.
+   */
+  size_t hash() const {
+    return gmpz_hash(d_value.get_mpz_t());
+  }
+
+  friend class CVC4::Rational;
+};/* class Integer */
+
+struct IntegerHashStrategy {
+  static inline size_t hash(const CVC4::Integer& i) {
+    return i.hash();
+  }
+};/* struct IntegerHashStrategy */
+
+std::ostream& operator<<(std::ostream& os, const Integer& n);
+
+}/* CVC4 namespace */
+
+#endif /* __CVC4__INTEGER_H */
+#endif /* __CVC4__USE_GMP_IMP */