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Because I also have a similar question, if we have the four files: main.lisp, file1.lisp, file2.lisp, util.lisp; file1 and file2 depend on util; main depends on file1 and file2. Is it correct to load in both file1 and file2 the util.lisp, and then just load in main the 1 & 2?

Thank you very much for the answers! I suppose I have to study more...

Thank you! That solved the problem. However, I get a continuable Error: "DEFUN/DEFMACRO(EXPT): #<PACKAGE COMMON-LISP> is locked" which leads to the following warnings: WARNING: DEFUN/DEFMACRO: redefining function EXPT in /Users/dp/work/fem/AD.lisp, was defined in C WARNING: |two-arg-EXPT| ...

Hallo, algorithmic differentiation differs from symbolic differentiation as well as numerical. In practice, it takes existing code (i.e., it does not do symbolic math in a new language) and computes the derivative of that function. As you may suspect Lisp is very suitable for AD. So, I'm trying to i...