/usr/include/sdpa_jordan.h is in libsdpa-dev 7.3.11+dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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This file is a component of SDPA
Copyright (C) 2004-2017 SDPA Project
This program 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 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
------------------------------------------------------------- */
#ifndef __sdpa_jordan_h__
#define __sdpa_jordan_h__
#include "sdpa_struct.h"
namespace sdpa {
class WorkVariables;
  
class Jal
{
public:
  static double trace(DenseLinearSpace& aMat);
  // calculate the minimum eigen value of lMat*xMat*(lMat^T)
  // by Lanczos methods.
  // lMat is lower triangular, xMat is symmetric
  // block size > 20   : Lanczos method
  // block size <= 20  : QR method
  static double getMinEigen(DenseLinearSpace& lMat,
			    DenseLinearSpace& xMat,
			    WorkVariables& work);
  // calculate the minimum eigen value of xMat by QR method.
  static double getMinEigen(DenseLinearSpace& xMat,
			    WorkVariables& work);
  static bool getInvChol(DenseLinearSpace& invCholMat,
			 DenseLinearSpace& aMat,
			 DenseLinearSpace& workMat);
  static bool getInvCholAndInv(DenseLinearSpace& invCholMat,
			       DenseLinearSpace& inverseMat,
			       DenseLinearSpace& aMat,
			       DenseLinearSpace& workMat);
  static bool multiply(DenseLinearSpace& retMat,
		       DenseLinearSpace& aMat,
		       DenseLinearSpace& bMat,
		       double* scalar = NULL);
#if 0
// CAUTION!!! We don't initialize retMat to zero matrix for efficiently.
  static bool multiply(DenseLinearSpace& retMat,
		       SparseLinearSpace& aMat,
		       DenseLinearSpace& bMat,
		       double* scalar = NULL);
// CAUTION!!! We don't initialize retMat to zero matrix for efficiently.
  static bool multiply(DenseLinearSpace& retMat,
		       DenseLinearSpace& aMat,
		       SparseLinearSpace& bMat,
		       double* scalar = NULL);
#endif
  //  retMat = L_{A} B = (A * B + B * A)/2
  static bool jordan_product(DenseLinearSpace& retMat,
			     DenseLinearSpace& aMat,
			     DenseLinearSpace& bMat);
  //  retMat = A * B
  static bool ns_jordan_product(DenseLinearSpace& retMat,
				DenseLinearSpace& aMat,
				DenseLinearSpace& bMat);
  
  //  retMat = P_{A} B = A * B * A 
  static bool jordan_quadratic_product(DenseLinearSpace& retMat,
				       DenseLinearSpace& aMat,
				       DenseLinearSpace& bMat,
				       DenseLinearSpace& work);
  
  //  retMat = Q_{A,C} B = (A * B * C + C * B * A)/2
  static bool jordan_triple_product(DenseLinearSpace& retMat,
				    DenseLinearSpace& aMat,
				    DenseLinearSpace& bMat,
				    DenseLinearSpace& cMat,
				    DenseLinearSpace& work);
  //  retMat = A * B * C
  static bool ns_jordan_triple_product(DenseLinearSpace& retMat,
				       DenseLinearSpace& aMat,
				       DenseLinearSpace& bMat,
				       DenseLinearSpace& cMat,
				       DenseLinearSpace& work);
};
} // end of namespace 'sdpa'
#endif // __sdpa_jordan_h__
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