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diff --git a/kig/misc/kignumerics.h b/kig/misc/kignumerics.h
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+/**
+ This file is part of Kig, a KDE program for Interactive Geometry...
+ Copyright (C) 2002  Maurizio Paolini <paolini@dmf.unicatt.it>
+
+ 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
+ USA
+**/
+
+#ifndef KIG_MISC_KIGNUMERICS_H
+#define KIG_MISC_KIGNUMERICS_H
+
+#include <cmath>
+
+double calcCubicRoot ( double xmin, double xmax, double a,
+      double b, double c, double d, int root, bool& valid, int& numroots );
+
+int calcCubicVariations (double x, double a, double b, double c,
+      double d, double p1a, double p1b, double p0a);
+
+double calcCubicRootwithNewton ( double ymin, double ymax, double a,
+    double b, double c, double d, double tol );
+
+/**
+ * Gaussian Elimination.  We return false if the matrix is singular,
+ * and can't be usefully eliminated..
+ */
+bool GaussianElimination( double *matrix[], int numrows, int numcols,
+                          int scambio[] );
+
+void BackwardSubstitution( double *matrix[], int numrows, int numcols,
+                           int scambio[], double solution[] );
+
+bool Invert3by3matrix ( const double m[3][3], double inv[3][3] );
+
+#endif // KIG_MISC_KIGNUMERICS_H