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Re: is it a bug?!please help.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg107218] Re: is it a bug?!please help.
  • From: JH <jlucio at ubu.es>
  • Date: Fri, 5 Feb 2010 07:13:08 -0500 (EST)
  • References: <hkgl3d$6t8$1@smc.vnet.net>

I don't have any answer. I have tried several things:

FullSimplify[\!\(
\*UnderoverscriptBox[\(\[Sum]\), \(i = 1\), \(n\)]\(a[i]\)\) + \!\(
\*UnderoverscriptBox[\(\[Sum]\), \(i = 1 + n\), \(m\)]\(a[i]\)\),
 n > 1 && m > n]

Solve[\!\(
\*UnderoverscriptBox[\(\[Sum]\), \(i = 1\), \(n\)]\(a[i]\)\) + \!\(
\*UnderoverscriptBox[\(\[Sum]\), \(i = 1 + n\), \(m\)]\(a[i]\)\) ==
  x, x, n]

AND

Reduce[\!\(
\*UnderoverscriptBox[\(\[Sum]\), \(i = 1\), \(n\)]\(a[i]\)\) + \!\(
\*UnderoverscriptBox[\(\[Sum]\), \(i = 1 + n\), \(m\)]\(a[i]\)\) ==
   x && m > n, x, Reals]

DON'T WORK, and I don't know why. Does anyone?

Other similar example is with definite integrals (Mathematica does no
simplification):

FullSimplify[\!\(
\*SubsuperscriptBox[\(\[Integral]\), \(a\), \(b\)]\(f[
     x] \[DifferentialD]x\)\) + \!\(
\*SubsuperscriptBox[\(\[Integral]\), \(b\), \(c\)]\(f[
     x] \[DifferentialD]x\)\), {x, f[x], a, b, c} \[Element] Reals]

AND THIS (?????)

FullSimplify[\!\(
\*SubsuperscriptBox[\(\[Integral]\), \(a\), \(b\)]\(f[
     x] \[DifferentialD]x\)\) + \!\(
\*SubsuperscriptBox[\(\[Integral]\), \(b\), \(a\)]\(f[
     x] \[DifferentialD]x\)\), {x, f[x], a, b, c} \[Element] Reals]

   JH


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