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diff --git a/src/internal/MatrixAlias.h b/src/internal/MatrixAlias.h
deleted file mode 100644
index 94d913a5f..000000000
--- a/src/internal/MatrixAlias.h
+++ /dev/null
@@ -1,84 +0,0 @@
-// This file is part of Eigen, a lightweight C++ template library
-// for linear algebra. Eigen itself is part of the KDE project.
-//
-// Copyright (C) 2006-2007 Benoit Jacob <jacob@math.jussieu.fr>
-//
-// Eigen is free software; you can redistribute it and/or modify it under the
-// terms of the GNU General Public License as published by the Free Software
-// Foundation; either version 2 or (at your option) any later version.
-//
-// Eigen 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 General Public License for more
-// details.
-//
-// You should have received a copy of the GNU General Public License along
-// with Eigen; if not, write to the Free Software Foundation, Inc., 51
-// Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
-//
-// As a special exception, if other files instantiate templates or use macros
-// or functions from this file, or you compile this file and link it
-// with other works to produce a work based on this file, this file does not
-// by itself cause the resulting work to be covered by the GNU General Public
-// License. This exception does not invalidate any other reasons why a work
-// based on this file might be covered by the GNU General Public License.
-
-#ifndef EIGEN_MATRIXALIAS_H
-#define EIGEN_MATRIXALIAS_H
-
-namespace Eigen
-{
-
-template<typename MatrixType> class MatrixAlias
-  : public EigenBase<typename MatrixType::Scalar, MatrixAlias<MatrixType> >
-{
-  public:
-    typedef typename MatrixType::Scalar Scalar;
-    typedef MatrixRef<MatrixAlias> Ref;
-    typedef EigenBase<typename MatrixType::Scalar, MatrixAlias> Base;
-    friend class EigenBase<typename MatrixType::Scalar, MatrixAlias>;
-    
-    MatrixAlias(MatrixType& matrix) : m_aliased(matrix), m_tmp(matrix) {}
-    MatrixAlias(const MatrixAlias& other) : m_aliased(other.m_aliased), m_tmp(other.m_tmp) {}
-    
-    ~MatrixAlias()
-    {
-      m_aliased = m_tmp;
-    }
-    
-    INHERIT_ASSIGNMENT_OPERATORS(MatrixAlias)
-
-  private:
-    Ref _ref() const
-    {
-      return Ref(*const_cast<MatrixAlias*>(this));
-    }
-    
-    int _rows() const { return m_tmp.rows(); }
-    int _cols() const { return m_tmp.cols(); }
-    
-    Scalar& _write(int row, int col)
-    {
-      return m_tmp.write(row, col);
-    }
-    
-    Scalar _read(int row, int col) const
-    {
-      return m_aliased.read(row, col);
-    }
-    
-  protected:
-    MatrixRef<MatrixType> m_aliased;
-    MatrixType m_tmp;
-};
-
-template<typename _Scalar, int _Rows, int _Cols>
-typename Matrix<_Scalar, _Rows, _Cols>::Alias
-Matrix<_Scalar, _Rows, _Cols>::alias()
-{
-  return Alias(*this);
-}
-
-} // namespace Eigen
-
-#endif // EIGEN_MATRIXALIAS_H