Re: [Maxima-discuss] radcan(sqrt(333-20*3^(5/2))) wrong

[Richard F. <fa...@gm...>]

For what it's worth, the input is a nested radical, not the intended
domain  for radcan. Also note that, mathematically, there are two values
for each sqrt. Radcan   picks one. It may be possible to extend  the
program to use denesting, but that doesn't  mean you're  going to choose
the same sign  as the program  in all cases.

On Sep 25, 2016 10:42 PM, "Robert Dodier" <rob...@gm...> wrote:

> On 2016-09-25, David Billinghurst <dbm...@gm...> wrote:
>
> > (%i45)  eq3:sqrt(6-3^(3/2));
> > (%o45)  sqrt(6-3^(3/2))
> >
> > (%i46)  float(%);
> > (%o46)  0.8965754721680539
> >
> > (%i47)  radcan(eq3);
> > (%o47)  sqrt(sqrt(3)-2)*sqrt(3)*%i
> >
> > (%i48)  float(%);
> > (%o48)  -0.8965754721680536
>
> For the record I find that Maxima 5.9.3 has this bug. So for better or
> worse it's not the result of tinkering over the last decade or so ...
>
> best
>
> Robert Dodier
>
>
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