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MathGroup Archive 1998

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Re: Wrong behaviour in package Algebra`AlgebraicInequalities`

  • To: mathgroup at smc.vnet.net
  • Subject: [mg14949] Re: Wrong behaviour in package Algebra`AlgebraicInequalities`
  • From: "Dale Horton" <daleh>
  • Date: Fri, 27 Nov 1998 03:49:46 -0500
  • Organization: Wolfram Research, Inc.
  • References: <7335f0$rvu@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

See

http://www.wolfram.com/support/Packages/Utilities/SubscriptedVariables.html

-Dale

Julian Stoev wrote in message <7335f0$rvu at smc.vnet.net>... Dear All,

Here I will give two examples. They should give identical results, but
the second one fails. It has varaibles with subscripts.

In[44]:=
SemialgebraicComponents[{(1*L1*(L2*L1 - L12^2))/8 > 0, L12 > 0}, {L1,
L2, L12}]
Out[44]=
                                 1
{{-1, -1, 2}, {-1, 1, 1}, {1, 1, -}}
                                 8

In[45]:=
SemialgebraicComponents[{(1*Subscript[L, 1]*
       (Subscript[L, 2]*Subscript[L, 1] - Subscript[L, 12]^2))/8 > 0,
Subscript[L, 12] > 0},
  {Subscript[L, 1], Subscript[L, 2], Subscript[L, 12]}] Part::partd:
   Part specification 1[[1]] is longer than depth of object.
Part::partd:
   Part specification 1[[2]] is longer than depth of object.
Part::partd:
   Part specification 1[[1]] is longer than depth of object.
General::stop:
   Further output of Part::partd
     will be suppressed during this calculation. Out[45]=
                                                2 {{-1, -1, L}, {-1, -1,
(-1)[[1]]}, {-1, -1, -L   },
                                              12

                                              2
  {-1, 1, L}, {-1, 1, (-1)[[1]]}, {-1, 1, -L   }, {1, -1, L},
                                            12

                               2
  {1, -1, 1[[1]]}, {1, -1, -L   }, {1, 1, L}, {1, 1, 1[[1]]},
                             12

             2
  {1, 1, -L   }}
           12


Thank you for your attention!

--Julian Stoev




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