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+.. _formula:
+
+.. index::
+   pair: command; formula
+
+Formula
+=======
+
+**Syntax**:(formula keyword)
+
+Set the current fractal formula. keyword should be one of the following:
+
+'mandel
+
+    Standard :ref:`Mandelbrot set <mandel>`.
+
+'mandel3
+
+    :ref:`Mandelbrot set, power 3 <mandel3>`.
+
+'mandel4
+
+    Mandelbrot set, power 4.
+
+'mandel5
+
+    Mandelbrot set, power 5.
+
+'mandel6
+
+    Mandelbrot set, power 6.
+
+'newton
+
+    :ref:`Newton's approximation method <newton>`.
+
+'barnsley
+
+    :ref:`First Barnsley's formula <barnsley>`.
+
+'octo
+
+    :ref:`Fractint's octo <octal>`.
+
+'phoenix
+
+    :ref:`Phoenix <phoenix>`.
+
+'magnet
+
+    :ref:`Magnet <magnet>`.
+
+**Available as**: command