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Feb 27 at 13:20 comment added user1661473 It is definitely a math question. I mentioned the LISP connection in case it helps: you can completely ignore the LISP part if it doesn't help you. In LISP, the graph is typically a DAG, and there is a set $A$ of "atoms" that serve as the out-degree zero vertices of that DAG. Here there is no atoms, so there must be cycles.
Feb 27 at 13:00 comment added Mikhail Katz Is this a math question or a LISP question?
S Feb 27 at 11:46 review First questions
Feb 27 at 13:49
S Feb 27 at 11:46 history asked user1661473 CC BY-SA 4.0