assuming certain properties about variables
- To: mathgroup at smc.vnet.net
- Subject: [mg111403] assuming certain properties about variables
- From: Benjamin Hell <hell at exoneon.de>
- Date: Sat, 31 Jul 2010 02:40:03 -0400 (EDT)
Hi, let's say I have defined the following function: f[x_?Positive] = x Now I want to evaluate f with a variable t: f[t] As mathematica knows nothing about t, the output is f[t] instead of t. How can I tell mathematica, that t should be a positive number so that Positive[t] evaluates true and then f[t] evaluates to t? Of course this is just an example, which should present what I would like to know. Thanks in advance.