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define function of functions

• To: mathgroup@smc.vnet.net
• Subject: [mg10634] define function of functions
• From: engp5095@leonis.nus.sg (Yang Hong)
• Date: Tue, 27 Jan 1998 03:09:59 -0500
• Organization: National University of Singapore

hi, there,

How do i tell mathematica that i would like to define a function x3(t) 
which is the the function of the functions x1(t) and x2(t)?

Thanks.