On May 25, 2:22 pm, John Cremona <john.crem...@gmail.com> wrote:
> If no-one else is more explicit I'll look for a reference tomorrow.

For the record, off-list John Cremona pointed me to "Fast Algorithms
for Linear Algebra mod N" by Storjohann and Mulders, where this is
called "stablization of  p  and  q  mod  r" and there is an
(apparently efficient) algorithm given (for integers).

Thanks, John.

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