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Question: f[a](b) (indexed function)

Question:f[a](b) (indexed function)

vv 13143
procedure indexed
July 18 2019
1

If f is a procedure e.g.  f := x -> x^2;  then f[a](b)  evaluates to f(b)  (= b^2).
Do you know where is this feature documented?
(I have used this in the past, but I need now a reference and I cannot find it).

 
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