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diff --git a/includes/algebra.hpp b/includes/algebra.hpp
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+//-*- mode: c++; indent-tabs-mode: t; coding: utf-8; show-trailing-whitespace: t -*-
+
+// file algebra.hpp
+
+#ifndef _ALGEBRA_HPP
+#define _ALGEBRA_HPP
+
+// System includes.
+
+#include <iostream>
+#include <iomanip>
+#include <cmath>
+
+// Local includes.
+
+#include "blkcom.hpp"
+#include "utilities.hpp"
+#include "movecopy.hpp"
+
+namespace algebra {
+  
+  bool cdivz(std::vector<double> &, \
+	     std::vector<double> &, \
+	     const double &,	    \
+	     const double &,	    \
+	     const double &,	    \
+	     const double &,	    \
+	     const long int &);
+  bool cmultz(std::vector<double> &,		\
+	      std::vector<double> &,		\
+	      const double &,			\
+	      const double &,			\
+	      const double &,			\
+	      const double &,			\
+	      const long int &);
+  bool trgwnd(const double &, double *);
+  bool addmxd(std::vector<double> &,		\
+	      const double &,			\
+	      std::vector<double> &,		\
+	      const size_t &);
+  bool multmx(std::vector<double> &, \
+	      std::vector<double> &, \
+	      std::vector<double> &, \
+	      std::vector<double> &, \
+	      const size_t &);
+  bool mult(std::vector<double> &, \
+	    std::vector<double> &, \
+	    std::vector<double> &, \
+	    const size_t &,	   \
+	    long int &);
+  void dgelg(std::vector<double> &, \
+	     std::vector<double> &, \
+	     const size_t &,	    \
+	     const size_t &,	    \
+	     const float &,	    \
+	     long int &);
+  void matmul(float [ 3 ][ 3 ], float [ 3 ][ 3 ]);
+  void matvec(float [ 3 ][ 3 ], float [ 15 ]);
+  
+}
+
+#endif // _ALGEBRA_HPP
+
+// end of file algebra.hpp