> AFAICS code using FSRED has design problem: due to random
> choice we may reduce denominator to 0.  I believe that
> in such case we should restart computations using different
> reduction.  But current code just signals error (which is
> definitely wrong).

Yes, that should be the correct solution.

> Computations with divisors may be quite heavy and take very
> long time (days, months and possibly years).  It may also
> need substantial memory, so after long computation you
> may funally run out of memory.

The problem is that if a=1, this integral can be computed in seconds,
I though replace the constant numerator with a symbol should
not make it takes much longer time.

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