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A Nontrivial Connected Digraph

Prove that a nontrivial connected digraph D is Eulerian if and only if E(D) can be partitioned into subsets E_i , 1<=i<=k, where [E_i] is a cycle for each i.
<= means less and equal.

Please can you explain this step by step and can you draw a graph.

Solution Summary

This is a proof regarding a nontrivial connected digraph.