Dear Waldek,
Thank you for your explanation. It's always hard to find the right
functions if one doesn't know it already.
I am always getting so frustrated when it comes to Expression(...).
I know one can do a lot of things with and within the Expression domain,
but I find it hard and cumbersome to take things apart to achieve what I
want. Actually, I fear that I am not alone with this issue.
Clearly, it is even hard to give a good name to a function that does
exactly what I want. And then this function would have to check that the
expression it gets as input has a certain format.
It's already difficult (or even impossible) to convert my s2 into
AlgebraicNumber.
(458) -> sqrt(s2)
+--------------------------------------------------------+
| +--+
\|1097675101059710976000 %i\|67 + 36223278334970462208000
(458) -----------------------------------------------------------
17
Type: Expression(Complex(Integer))
Maybe I must study Expression even more. But we certainly need more
examples of how to convert from Expression to some more specific
domains. This is what I am currently lacking.
Ralf
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