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The mathematical rules for differentiation of sums, products, quotients,
elementary functions in conjunction with the chain rule for compound functions
are applied. The function should be expressed as one or more FORTRAN 90
or FORTRAN 77 procedures. A new type of variables is defined and the
overloading mechanism of functions and operators provided by
the FORTRAN 90 language is extensively used to implement the differentiation rules.
Stavros Farantos
1999-12-11