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\chapter{Mathematical expressions}
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At several points within \PyX{} mathematical expressions can be
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provided in form of string parameters. They are evaluated by the
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module \verb|mathtree|. This module is not described further in this
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user manual, because it is considered to be a technical detail. We
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just give a list of available operators, functions and predefined
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\verb|+|; \verb|-|; \verb|*|; \verb|/|; \verb|**|
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\verb|neg| (negate); \verb|abs| (absolute value); \verb|sgn| (signum);
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\verb|sqrt| (square root); \verb|exp|; \verb|log| (natural logarithm);
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\verb|sin|, \verb|cos|, \verb|tan|, \verb|asin|, \verb|acos|,
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\verb|atan| (trigonometric functions in radian units); \verb|sind|,
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\verb|cosd|, \verb|tand|, \verb|asind|, \verb|acosd|, \verb|atand| (as
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before but in degree units); \verb|norm| ($\sqrt{a^2+b^2}$ as an
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example for functions with multiple arguments)
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\item[predefined variables:]
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\verb|pi| ($\pi$); \verb|e| ($e$)
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manual/mathtree.tex
