On Monday, June 30, 2014 1:52:50 AM UTC-4, John Cremona wrote: > > Be careful though: > > sage: (sqrt(-2)*sqrt(-3)).simplify_radical() > -sqrt(3)*sqrt(2) > > i.e. you cannot use sqrt(a)*sqrt(b)=sqrt(a*b) everywhere without > reaching a contradiction. > > sage: bool( (sqrt(-2)*sqrt(-3)) == sqrt(2)*sqrt(3) ) > False > > +1
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