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About Reduce and Mod

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96875] About Reduce and Mod
  • From: olfa <olfa.mraihi at yahoo.fr>
  • Date: Thu, 26 Feb 2009 07:59:14 -0500 (EST)

Hi Mathematica community,
I have this input:   Reduce[{Mod[x, 5] == Mod[xP, 5], 0 <= xP < 5},
{xP}, Backsubstitution -> True]
Mathematicas gives me this output:0 <= Re[Mod[x, 5]] < 5 && Im[Mod[x,
5]] == 0 && xP == Mod[x, 5]
1)but why there is 0 <= Re[Mod[x, 5]] < 5 && Im[Mod[x, 5]] == 0 as
part of the output ?
2) and how could I eliminate it (by adding something in reduce for
example) because all that I want is only this output xP == Mod[x, 5]?

thank you very much.


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