There is a bug on the free version REDUCE, REDUCE3.8
on "sqrt". it behavies like:
/auto/home90/fdc08 79: reduce_op
Loading image file :/usr/local/reduce_open/pslbuild/x86_64-unknown-fedora7/red/reduce.img
Reduce (Free PSL version), 30-Sep-2009 …
a := x **2 - 2*x + 1
x - 1
But it should be: abs(1-x)
This has been fixed now. It was a regression. Additionally I added a new switch precise_complex which, when tuned on, would leave the sqrt above unchanged as for general complex-valued x in the example above the simplification would not be valid.
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