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Question: Invoking procedures assigned to symbols by indexed names

Question:Invoking procedures assigned to symbols by indexed names

Hynek Baran 63 Maple
procedure
August 09 2011
1

Sorry for may be stupid question, but please see the following example:

a := proc() A end:
a();
                               A
a[b]();
                               A
Why a() is invoked on the last line?

Is it possible to determine (inside a() definition) how a() was invoked?

Thank you for your answers.
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