Re: Looking for an example

*To*: mathgroup at smc.vnet.net*Subject*: [mg89822] Re: Looking for an example*From*: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>*Date*: Sat, 21 Jun 2008 05:32:37 -0400 (EDT)*Organization*: The Open University, Milton Keynes, UK*References*: <g3g037$l2i$1@smc.vnet.net>

ah3133 wrote: > I tried posting this once but I think I screwed it up, sorry if this a > repost. It is not clear, at least to me, whether you use Mathematica. Since this newsgroup is dedicated to Mathematica, software made and published by Wolfram Research, Inc., I shall assume that you are using it and show you an example written in Mathematica. > I'm looking for an example of an equation which has multiple possible > integers for the domain, but only one possible integer for the range. Here, I believe you are talking about a *surjective* function from a subset of Z to another subset of Z. > I want the domain to be a set of numbers that increase by a set > increment ( like 2,3,4,5 or 2, 4,6,8 ) and I want don't want the range > to be 0 or 1. Assuming I have correctly understood all your requirements, the following function should fit your needs. In[22]:= f[x_Integer] = Mod[x, 2, 1]; f /@ Range[2, 8, 2] // Union Out[23]= {2} Regards, -- Jean-Marc