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Why this cannot be solved

  • To: mathgroup at smc.vnet.net
  • Subject: [mg116153] Why this cannot be solved
  • From: olfa <olfa.mraihi at yahoo.fr>
  • Date: Thu, 3 Feb 2011 05:32:54 -0500 (EST)

Hi Mathematica community,
System 1)
Reduce[Max[e, s + a[i]] == Max[c, d + aP[iP]] && d == s - a[n]
+Sum[a[j],{j,i,n}] &&
   aP == a && iP == n, {aP, iP, d, c}, Reals]

this gives:
Reduce::nsmet: This system cannot be solved with the methods available
to Reduce.

System 2)
Reduce[Max[e, s + a[i]] == Max[c, d + aP[iP]] && d == s - a[n]
+Sum[a[j],{j,i,n}] , { d, c}, Reals]

this gives solutions.

the only difference between them is the variables aP and iP and their
respective equations.
What I didn't understand is why the first system cannot be solved
although I have given values for iP and aP inside of it?

thank you.


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