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Question: How to select functions from a list

Question:How to select functions from a list

sand15 615 Maple
select indets
December 03 2019
0

Hi,


I have a set of functions of the form P :=  { a(t), b(t), f(g(t)), u(v(w(t)), A(a(t), b(t)), ... } and I want to obtain the set Q := { a(t), b(t), g(t), w(t) } (that is the set of the innermost functions)
Since more than an hour I'm fighting without success with select and parmatch and I'm desperatly askink for your help.

Thanks in advance
 
PS : the list P only contains functions of t, never of t and of another variables.
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