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diff --git a/src/math-variables.h b/src/math-variables.h
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+/*  Copyright (c) 2008-2009 Robert Ancell
+ *
+ *  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, 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 MATH_VARIABLES_H
+#define MATH_VARIABLES_H
+
+#include <glib-object.h>
+#include "mp.h"
+
+G_BEGIN_DECLS
+
+#define MATH_VARIABLES(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), math_equation_get_type(), MathVariables))
+
+typedef struct MathVariablesPrivate MathVariablesPrivate;
+
+typedef struct
+{
+    GObject parent_instance;
+    MathVariablesPrivate *priv;
+} MathVariables;
+
+typedef struct
+{
+    GObjectClass parent_class;
+} MathVariablesClass;
+
+GType math_variables_get_type(void);
+
+MathVariables *math_variables_new(void);
+
+gchar **math_variables_get_names(MathVariables *variables);
+
+void math_variables_set_value(MathVariables *variables, const char *name, const MPNumber *value);
+
+MPNumber *math_variables_get_value(MathVariables *variables, const char *name);
+
+#endif /* MATH_VARIABLES_H */