the composition operator
the repeated composition operator
f @ g
f @@ n
@ is the function composition operator.
@@ is the repeated function composition operator.
If n is negative, the invfunc table is checked to see if it has an entry for f. That is, if invfuncf=g, then f@@n−−>g@@−n.
Composition also applies to procedures. However, given two procedures f and g, the composition f@g is of type function, not type procedure. For more information, see type/function and type/procedure.
The @ and @@ operators are thread-safe as of Maple 15.
For more information on thread safety, see index/threadsafe.
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