John Cremona describes an use of the algebraic QQbar domain :
Then I test
a=sqrt(2)-sqrt(3)
b=sqrt(3)-sqrt(2)
QQbar(a).minpoly() ; QQbar(b).minpoly() # seems right. The same even
polynom.
But the test and the numerical values are True. I get +0.31 in both cases.
QQbar(a)==QQbar(b)
This method doesn't seem right for naive expression tests, in the
calculus word not the algebraic one.
F.
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