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Re: Picewise Function

  • To: mathgroup at
  • Subject: [mg82089] Re: Picewise Function
  • From: Jens-Peer Kuska <kuska at>
  • Date: Fri, 12 Oct 2007 02:47:50 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <fek98d$lae$>
  • Reply-to: kuska at


how to find out that the function is undefined when the
"result of the evaluation is <= 0.25."
without evaluate it ??

Or may a simple

res= (est07[zve + kap] - est07[zve])/kap;

help ??


Frank Hechtner wrote:
> hi,
> I'm in trouble with a function. i created the following one
> (est07[zve + kap] - est07[zve])/kap (something about german taxes, 
> refers to other functions)
> Now i want mathematica to tell that this function uses a specific 
> domain. The function should only be defined if the result of the 
> evaluation is <= 0.25.
> Does anyone know how to realize this=?
> Thanks for help
> frank

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