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Maxima -- GPL CAS based on DOE-MACSYMA

Computer Algebra System written in Common Lisp

Brought to you by: andrejv, kjak, l_butler, robert_dodier, and 2 others

[Maxima-bugs] [ maxima-Bugs-861870 ] rootscontract expands unnecessarily

[Maxima-bugs] [ maxima-Bugs-861870 ] rootscontract expands unnecessarily

From: SourceForge.net <noreply@so...> - 2003-12-17 19:32:08

Bugs item #861870, was opened at 2003-12-17 14:28
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=861870&group_id=4933

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Stavros Macrakis (macrakis)
Assigned to: Nobody/Anonymous (nobody)
Summary: rootscontract expands unnecessarily

Initial Comment:
rootscontract((4*t+4)^(1/2)/(32*t+32)^(1/5)),
   rootsconmode:all
      => (t^3+3*t^2+3*t+1)^(1/10)
instead of
   (t+1)^(3/10)

There is no good reason for it to be expanding the wole 
thing when there is a non-trivial gcd.  At worst, it could 
give the result in the form:

   (4*t+4)^(3/10)/8^(1/5)

Then again, there doesn't seem to be any equivalent of 
rootscontract for *integral* powers.  How do you simplify

  (4*t+4)^20/(t+1)^20

to 2^40

without using factor (which in general of course is much 
more expensive than GCD)?


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=861870&group_id=4933

Thread view

[Maxima-bugs] [ maxima-Bugs-861870 ] rootscontract expands unnecessarily

From: SourceForge.net <noreply@so...> - 2003-12-17 19:32:08

Bugs item #861870, was opened at 2003-12-17 14:28
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=861870&group_id=4933

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Stavros Macrakis (macrakis)
Assigned to: Nobody/Anonymous (nobody)
Summary: rootscontract expands unnecessarily

Initial Comment:
rootscontract((4*t+4)^(1/2)/(32*t+32)^(1/5)),
   rootsconmode:all
      => (t^3+3*t^2+3*t+1)^(1/10)
instead of
   (t+1)^(3/10)

There is no good reason for it to be expanding the wole 
thing when there is a non-trivial gcd.  At worst, it could 
give the result in the form:

   (4*t+4)^(3/10)/8^(1/5)

Then again, there doesn't seem to be any equivalent of 
rootscontract for *integral* powers.  How do you simplify

  (4*t+4)^20/(t+1)^20

to 2^40

without using factor (which in general of course is much 
more expensive than GCD)?


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=861870&group_id=4933

[Maxima-bugs] [ maxima-Bugs-861871 ] rootscontract expands unnecessarily

From: SourceForge.net <noreply@so...> - 2003-12-17 19:32:08

Bugs item #861871, was opened at 2003-12-17 14:29
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=861871&group_id=4933

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Stavros Macrakis (macrakis)
Assigned to: Nobody/Anonymous (nobody)
Summary: rootscontract expands unnecessarily

Initial Comment:
rootscontract((4*t+4)^(1/2)/(32*t+32)^(1/5)),
   rootsconmode:all
      => (t^3+3*t^2+3*t+1)^(1/10)
instead of
   (t+1)^(3/10)

There is no good reason for it to be expanding the wole 
thing when there is a non-trivial gcd.  At worst, it could 
give the result in the form:

   (4*t+4)^(3/10)/8^(1/5)

Then again, there doesn't seem to be any equivalent of 
rootscontract for *integral* powers.  How do you simplify

  (4*t+4)^20/(t+1)^20

to 2^40

without using factor (which in general of course is much 
more expensive than GCD)?


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=861871&group_id=4933

[Maxima-bugs] [ maxima-Bugs-861873 ] rootscontract expands unnecessarily

From: SourceForge.net <noreply@so...> - 2003-12-17 19:32:08

Bugs item #861873, was opened at 2003-12-17 14:29
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=861873&group_id=4933

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Stavros Macrakis (macrakis)
Assigned to: Nobody/Anonymous (nobody)
Summary: rootscontract expands unnecessarily

Initial Comment:
rootscontract((4*t+4)^(1/2)/(32*t+32)^(1/5)),
   rootsconmode:all
      => (t^3+3*t^2+3*t+1)^(1/10)
instead of
   (t+1)^(3/10)

There is no good reason for it to be expanding the wole 
thing when there is a non-trivial gcd.  At worst, it could 
give the result in the form:

   (4*t+4)^(3/10)/8^(1/5)

Then again, there doesn't seem to be any equivalent of 
rootscontract for *integral* powers.  How do you simplify

  (4*t+4)^20/(t+1)^20

to 2^40

without using factor (which in general of course is much 
more expensive than GCD)?


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=861873&group_id=4933

[Maxima-bugs] [ maxima-Bugs-861873 ] rootscontract expands unnecessarily

From: SourceForge.net <noreply@so...> - 2003-12-17 19:33:00

Bugs item #861873, was opened at 2003-12-17 14:29
Message generated for change (Settings changed) made by macrakis
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=861873&group_id=4933

Category: None
Group: None
>Status: Deleted
>Resolution: Duplicate
Priority: 5
Submitted By: Stavros Macrakis (macrakis)
Assigned to: Nobody/Anonymous (nobody)
Summary: rootscontract expands unnecessarily

Initial Comment:
rootscontract((4*t+4)^(1/2)/(32*t+32)^(1/5)),
   rootsconmode:all
      => (t^3+3*t^2+3*t+1)^(1/10)
instead of
   (t+1)^(3/10)

There is no good reason for it to be expanding the wole 
thing when there is a non-trivial gcd.  At worst, it could 
give the result in the form:

   (4*t+4)^(3/10)/8^(1/5)

Then again, there doesn't seem to be any equivalent of 
rootscontract for *integral* powers.  How do you simplify

  (4*t+4)^20/(t+1)^20

to 2^40

without using factor (which in general of course is much 
more expensive than GCD)?


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=861873&group_id=4933

[Maxima-bugs] [ maxima-Bugs-861871 ] rootscontract expands unnecessarily

From: SourceForge.net <noreply@so...> - 2003-12-17 19:33:12

Bugs item #861871, was opened at 2003-12-17 14:29
Message generated for change (Settings changed) made by macrakis
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=861871&group_id=4933

Category: None
Group: None
>Status: Deleted
>Resolution: Duplicate
Priority: 5
Submitted By: Stavros Macrakis (macrakis)
Assigned to: Nobody/Anonymous (nobody)
Summary: rootscontract expands unnecessarily

Initial Comment:
rootscontract((4*t+4)^(1/2)/(32*t+32)^(1/5)),
   rootsconmode:all
      => (t^3+3*t^2+3*t+1)^(1/10)
instead of
   (t+1)^(3/10)

There is no good reason for it to be expanding the wole 
thing when there is a non-trivial gcd.  At worst, it could 
give the result in the form:

   (4*t+4)^(3/10)/8^(1/5)

Then again, there doesn't seem to be any equivalent of 
rootscontract for *integral* powers.  How do you simplify

  (4*t+4)^20/(t+1)^20

to 2^40

without using factor (which in general of course is much 
more expensive than GCD)?


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=861871&group_id=4933