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diff --git a/src/cml/quaternion/conjugate.h b/src/cml/quaternion/conjugate.h
deleted file mode 100644
index 63bdcb0..0000000
--- a/src/cml/quaternion/conjugate.h
+++ /dev/null
@@ -1,197 +0,0 @@
-/* -*- C++ -*- ------------------------------------------------------------
- 
-Copyright (c) 2007 Jesse Anders and Demian Nave http://cmldev.net/
-
-The Configurable Math Library (CML) is distributed under the terms of the
-Boost Software License, v1.0 (see cml/LICENSE for details).
-
- *-----------------------------------------------------------------------*/
-/** @file
- *  @brief Defines an operator for quaternion conjugation.
- */
-
-#ifndef conjugate_h
-#define conjugate_h
-
-#include <cml/quaternion/quaternion_expr.h>
-
-namespace cml {
-namespace et {
-
-/** An expression node for conjugating a quaternion. */
-template<class ExprT>
-class ConjugateOp
-{
-  public:
-
-    typedef ConjugateOp<ExprT> expr_type;
-
-    /* Record ary-ness of the expression: */
-    typedef unary_expression expr_ary;
-
-    /* Copy the expression by value into higher-up expressions: */
-    typedef expr_type expr_const_reference;
-
-    typedef typename ExprT::value_type value_type;
-    typedef quaternion_result_tag result_tag;
-    typedef typename ExprT::size_tag size_tag;
-
-    /* Store the expression traits for the subexpression: */
-    typedef ExprTraits<ExprT> expr_traits;
-
-    /* Reference type for the subexpression: */
-    typedef typename expr_traits::const_reference expr_reference;
-
-    /* Get the result type (same as for subexpression): */
-    typedef typename expr_traits::result_type result_type;
-
-    /* For matching by assignability: */
-    typedef cml::et::not_assignable_tag assignable_tag;
-
-    /* Get the temporary type: */
-    typedef typename result_type::temporary_type temporary_type;
-
-    /* Get the vector type: */
-    typedef typename result_type::vector_type vector_type;
-
-    /* Get the imaginary part type: */
-    typedef typename vector_type::subvector_type imaginary_type;
-
-    /* Record the order type: */
-    typedef typename result_type::order_type order_type;
-
-
-  public:
-
-    /** Record result size as an enum. */
-    enum { array_size = ExprT::array_size };
-
-    /** Localize the ordering as an enum. */
-    enum {
-        W = order_type::W,
-        X = order_type::X,
-        Y = order_type::Y,
-        Z = order_type::Z
-    };
-
-
-  public:
-
-    /** Return the real part of the expression. */
-    value_type real() const {
-        return m_expr.real();
-    }
-
-    /** Return the vector part of the expression. */
-    imaginary_type imaginary() const {
-        return -m_expr.imaginary();
-    }
-
-    /** Return the Cayley norm of the expression. */
-    value_type norm() const {
-        return length_squared();
-    }
-
-    /** Return square of the quaternion length. */
-    value_type length_squared() const {
-        return dot(
-                QuaternionXpr<expr_type>(*this),
-                QuaternionXpr<expr_type>(*this));
-    }
-
-    /** Return the quaternion length. */
-    value_type length() const {
-        return std::sqrt(length_squared());
-    }
-
-    /** Return the result as a normalized quaternion. */
-    temporary_type normalize() const {
-        temporary_type q(QuaternionXpr<expr_type>(*this));
-        return q.normalize();
-    }
-
-    /** Compute conjugated result at index i.
-     *
-     * The conjugate of quaternion s + v is s - v.
-     */
-    value_type operator[](size_t i) const {
-        return (i == W) ? m_expr[W] : - m_expr[i] ;
-    }
-
-
-  public:
-
-    /** Return size of this expression (same as argument's size). */
-    size_t size() const {
-        return m_expr.size();
-    }
-
-    /** Return reference to contained expression. */
-    expr_reference expression() const { return m_expr; }
-
-
-  public:
-
-    /** Construct from the subexpression. */
-    explicit ConjugateOp(expr_reference expr) : m_expr(expr) {}
-
-    /** Copy constructor. */
-    ConjugateOp(const expr_type& e) : m_expr(e.m_expr) {}
-
-
-  protected:
-
-    expr_reference m_expr;
-
-
-  private:
-
-    /* Cannot be assigned to: */
-    expr_type& operator=(const expr_type&);
-};
-
-/** Expression traits class for ConjugateOp<>. */
-template<class ExprT>
-struct ExprTraits< ConjugateOp<ExprT> >
-{
-    typedef ConjugateOp<ExprT> expr_type;
-    typedef ExprT arg_type;
-
-    typedef typename expr_type::value_type value_type;
-    typedef typename expr_type::expr_const_reference const_reference;
-    typedef typename expr_type::result_tag result_tag;
-    typedef typename expr_type::size_tag size_tag;
-    typedef typename expr_type::result_type result_type;
-    typedef typename expr_type::assignable_tag assignable_tag;
-    typedef expr_node_tag node_tag;
-
-    value_type get(const expr_type& v, size_t i) const { return v[i]; }
-    size_t size(const expr_type& e) const { return e.size(); }
-};
-
-} // namespace et
-
-/** Conjugation of a quaternion. */
-template<typename E, class AT, class OT, class CT> inline
-et::QuaternionXpr< et::ConjugateOp< quaternion<E,AT,OT,CT> > >
-conjugate(const quaternion<E,AT,OT,CT>& arg)
-{
-    typedef et::ConjugateOp< quaternion<E,AT,OT,CT> > ExprT;
-    return et::QuaternionXpr<ExprT>(ExprT(arg));
-}
-
-/** Conjugation of a QuaternionXpr. */
-template<class XprT> inline
-et::QuaternionXpr< et::ConjugateOp<XprT> >
-conjugate(QUATXPR_ARG_TYPE arg)
-{
-    typedef et::ConjugateOp<XprT> ExprT;
-    return et::QuaternionXpr<ExprT>(ExprT(arg.expression()));
-}
-
-} // namespace cml
-
-#endif
-
-// -------------------------------------------------------------------------
-// vim:ft=cpp