Hi @S.G.Janssens, there are some efforts to provide a Fortran wrapper of the symengine code here: cwrapper module [WIP] by ivan-pi · Pull Request #5 · symengine/symengine.f90 · GitHub. Currently, the Fortran routines are only at a level equivalent to the C API. You can find a few more comments about it in an older thread: Code Generation Using Sympy
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