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Picewise Function

• To: mathgroup at smc.vnet.net
• Subject: [mg82072] Picewise Function
• From: Frank Hechtner <frank.hechtner at rub.de>
• Date: Thu, 11 Oct 2007 00:20:58 -0400 (EDT)

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