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## Re: [Axiom-developer] "empty list" results, inverse trig substitutions,

**From**: |
Bill Page |

**Subject**: |
Re: [Axiom-developer] "empty list" results, inverse trig substitutions, "Floats" in "solve" |

**Date**: |
Sat, 3 Oct 2009 14:57:15 -0400 |

On Sat, Oct 3, 2009 at 2:20 PM, William Sit <address@hidden> wrote:
>
>* I can't do much with the tan problem, since we have:*
>
>* solve([tan(b) = a],[b])*
>*>>*
>*>> Error detected within library code:*
>
>* No identity element for reduce of empty list using operation*
>* append*
>
>* (You mileage may differ, since I am using a very old version of Axiom).*
>
>* This is clearly a bug, for the old version.*
>
Both Axiom (February 2009) and OpenAxiom (current) return
(1) -> solve([tan(b) = a],[b])
(1) []
Type: List List Equation Expression Integer
But FriCAS gives:
address@hidden:~$ fricas -nox
FriCAS (AXIOM fork) Computer Algebra System
Version: FriCAS 2009-09-17
Timestamp: Wednesday September 30, 2009 at 22:17:16
-----------------------------------------------------------------------------
Issue )copyright to view copyright notices.
Issue )summary for a summary of useful system commands.
Issue )quit to leave FriCAS and return to shell.
-----------------------------------------------------------------------------
(1) ->
(1) -> solve([tan(b) = a],[b])
(1) [[b= 0]]
Type: List(List(Equation(Expression(Integer))))
(2) ->
Regards,
Bill Page.

**[Axiom-developer] "empty list" results, inverse trig substitutions, "Floats" in "solve"**, *James*, `2009/10/02`
**Re: [Axiom-developer] "empty list" results, inverse trig substitutions, "Floats" in "solve"**, *William Sit*, `2009/10/03`
**Re: [Axiom-developer] "empty list" results, inverse trig substitutions, "Floats" in "solve"**,
*Bill Page* **<=**

**Re: [Axiom-developer] "empty list" results, inverse trig substitutions, "Floats" in "solve"**, *William Sit*, `2009/10/04`