(I didn't receive this message in mailbox, strange...)

Strange indeed. I was also surprised that I didn't get a message from github when I opened an issue. But maybe the OP doesn't get notified, which maybe OK.

I searched through source files, and found that riemannZeta
is purely symbolic, you can not evaluate it numerically at all.

Oh, I am relieved that it is not only me. I also looked through the code and couldn't find a function that evaluates riemannZeta.

Looks like evaluation of special functions is implemented in DoubleFloat.

https://fricas.github.io/api/DoubleFloat

Look at the respective file sf.spad to find out which special functions come with an evaluation.

Or maybe you look here...

https://github.com/fricas/fricas/blob/master/src/algebra/special.spad#L1

Sorry, that this will not be of much help.

Ralf

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