[Maxima-bugs] [ maxima-Bugs-1990595 ] Bug in radcan

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Bugs item #1990595, was opened at 2008-06-11 12:32
Message generated for change (Settings changed) made by beshenov
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Category: Lisp Core - Simplification
Group: None
>Status: Deleted
Resolution: Rejected
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Bug in radcan

Initial Comment:


Maxima version: 5.15.0
Maxima build date: 17:36 4/20/2008
host type: i686-pc-mingw32
lisp-implementation-type: GNU Common Lisp (GCL)
lisp-implementation-version: GCL 2.6.8

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The above information is also available from the Maxima function build_info().

(%o2)
(%i3) sqrt(x^2+x^3);
                                       3    2
(%o3)                            sqrt(x  + x )
(%i4) factor(sqrt(x^2+x^3));
(%o4)                         sqrt(x + 1) abs(x)
(%i5) radcan(sqrt(x^2+x^3));
(%o5)                            x sqrt(x + 1)
(%i6)


While factor got this right radcan yields a incorrect result.




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Comment By: Alexey Beshenov (beshenov)
Date: 2008-07-02 03:33

Message:
Logged In: YES 
user_id=1498309
Originator: NO

sqrt(x + 1) abs(x) is not a correct algebraic value, in contrast to x
sqrt(x + 1).

This radcan issue is being reported frequently, but it's not a bug.

This tracker item should be closed.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=1990595&group_id=4933