Thanks. I must say that except the inversion example, this is still not specific enough for me to decide if SymPy (and other tools) are inferior, as you claim -

Thanks. I must say that except the inversion example, this is still not specific enough for me to decide if SymPy (and other tools) are inferior, as you claim -- in particular, I can't tell if they are going to be inferior in doing the kinds of things I need done.