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+GNU libmatheval is a library which contains several procedures that make
+it possible to create an in-memory tree from the string representation
+of a mathematical function over single or multiple variables. This tree
+can be used later to evaluate a function for specified variable values,
+to create a corresponding tree for the function derivative over a
+specified variable, or to write a textual tree representation to a
+specified string. The library exposes C and Fortran 77 interfaces.