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diff --git a/src/math-equation.h b/src/math-equation.h
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+/*  Copyright (c) 1987-2008 Sun Microsystems, Inc. All Rights Reserved.
+ *  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_EQUATION_H
+#define MATH_EQUATION_H
+
+#include <glib-object.h>
+#include <gtk/gtk.h>
+#include "mp.h"
+#include "math-variables.h"
+
+G_BEGIN_DECLS
+
+#define MATH_EQUATION(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), math_equation_get_type(), MathEquation))
+
+typedef struct MathEquationPrivate MathEquationPrivate;
+
+typedef struct
+{
+    GtkTextBuffer parent_instance;
+    MathEquationPrivate *priv;
+} MathEquation;
+
+typedef struct
+{
+    GtkTextBufferClass parent_class;
+} MathEquationClass;
+
+/* Number display mode. */
+typedef enum {
+  FIX,
+  SCI,
+  ENG
+} DisplayFormat;
+
+typedef enum {
+    NORMAL,
+    SUPERSCRIPT,
+    SUBSCRIPT
+} NumberMode;
+
+GType math_equation_get_type(void);
+MathEquation *math_equation_new(void);
+
+MathVariables *math_equation_get_variables(MathEquation *equation);
+
+const gchar *math_equation_get_digit_text(MathEquation *equation, guint digit);
+const gchar *math_equation_get_numeric_point_text(MathEquation *equation);
+const gchar *math_equation_get_thousands_separator_text(MathEquation *equation);
+
+void math_equation_set_status(MathEquation *equation, const gchar *status);
+const gchar *math_equation_get_status(MathEquation *equation);
+
+gboolean math_equation_is_empty(MathEquation *equation);
+gboolean math_equation_is_result(MathEquation *equation);
+gchar *math_equation_get_display(MathEquation *equation);
+gchar *math_equation_get_equation(MathEquation *equation);
+gboolean math_equation_get_number(MathEquation *equation, MPNumber *z);
+
+void math_equation_set_number_mode(MathEquation *equation, NumberMode mode);
+NumberMode math_equation_get_number_mode(MathEquation *equation);
+
+void math_equation_set_accuracy(MathEquation *equation, gint accuracy);
+gint math_equation_get_accuracy(MathEquation *equation);
+
+void math_equation_set_show_thousands_separators(MathEquation *equation, gboolean visible);
+gboolean math_equation_get_show_thousands_separators(MathEquation *equation);
+
+void math_equation_set_show_trailing_zeroes(MathEquation *equation, gboolean visible);
+gboolean math_equation_get_show_trailing_zeroes(MathEquation *equation);
+
+void math_equation_set_number_format(MathEquation *equation, DisplayFormat format);
+DisplayFormat math_equation_get_number_format(MathEquation *equation);
+
+void math_equation_set_base(MathEquation *equation, gint base);
+gint math_equation_get_base(MathEquation *equation);
+
+void math_equation_set_word_size(MathEquation *equation, gint word_size);
+gint math_equation_get_word_size(MathEquation *equation);
+
+void math_equation_set_angle_units(MathEquation *equation, MPAngleUnit angle_unit);
+MPAngleUnit math_equation_get_angle_units(MathEquation *equation);
+
+void math_equation_set_source_currency(MathEquation *equation, const gchar *currency);
+const gchar *math_equation_get_source_currency(MathEquation *equation);
+
+void math_equation_set_target_currency(MathEquation *equation, const gchar *currency);
+const gchar *math_equation_get_target_currency(MathEquation *equation);
+
+const MPNumber *math_equation_get_answer(MathEquation *equation);
+
+void math_equation_copy(MathEquation *equation);
+void math_equation_paste(MathEquation *equation);
+void math_equation_undo(MathEquation *equation);
+void math_equation_redo(MathEquation *equation);
+void math_equation_store(MathEquation *equation, const gchar *name);
+void math_equation_recall(MathEquation *equation, const gchar *name);
+void math_equation_set(MathEquation *equation, const gchar *text);
+void math_equation_set_number(MathEquation *equation, const MPNumber *x);
+void math_equation_insert(MathEquation *equation, const gchar *text);
+void math_equation_insert_digit(MathEquation *equation, guint digit);
+void math_equation_insert_numeric_point(MathEquation *equation);
+void math_equation_insert_number(MathEquation *equation, const MPNumber *x);
+void math_equation_insert_subtract(MathEquation *equation);
+void math_equation_insert_exponent(MathEquation *equation);
+void math_equation_solve(MathEquation *equation);
+void math_equation_factorize(MathEquation *equation);
+void math_equation_delete(MathEquation *equation);
+void math_equation_backspace(MathEquation *equation);
+void math_equation_clear(MathEquation *equation);
+void math_equation_shift(MathEquation *equation, gint count);
+void math_equation_toggle_bit(MathEquation *equation, guint bit);
+
+//FIXME: Obsolete
+void display_make_number(MathEquation *equation, char *target, int target_len, const MPNumber *x);
+
+#endif /* MATH_EQUATION_H */