Question: Prove the theorem a # A loopless digraph has an indpendent sets such that each vertex of not in s is reachable from a resten

Prove the theorem Prove the theorem a # A loopless digraph has an indpendent sets

a # A loopless digraph has an indpendent sets such that each vertex of not in s is reachable from a resten ins by directed path of length at most two

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