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compute limit

• To: mathgroup at smc.vnet.net
• Subject: [mg70533] compute limit
• From: Frank Hechtner <frank.hechtner at rub.de>
• Date: Thu, 19 Oct 2006 03:21:42 -0400 (EDT)

Hi,

i?m in trouble with the calculation of limits. my expression is the 
following

((1 + r)^t*(1 - s) + s)^(1/t) - 1, t -> ?

as you see, the limit is r when x approaches ?.

Unfortunately when using limit the output is

Limit[((1 + r)^t*(1 - s) + s)^(1/t) - 1, t -> ?].

I dont see whats going wrong. Does limit only compute numerical expression?

Thanks for your help

Frank