# Randomly Eulerian Graphs

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Recall that a graph G is randomly Eulerian from a vertex x if and maximal trail starting at x in an Euler circuit. (If T = xx_1 ... x_l, then T is a maximal trail starting at x iff x_l is an isolated vertex in G - E(T).) Prove that a nonempty graph G is randomly Eulerian from x iff G has an Euler circuit and x is contained in every cycle of G.

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Randomly Eulerian Graphs are investigated. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.

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Proof that a nonempty graph G is randomly Eulerian from vertex V if and only if G has an Euler circuit (G is an Eulerian graph) and V is contained in every cycle of G.

(1) Direction "if":

From contradiction:

Suppose G is an Eulerian graph and vertex V is contained in every cycle of G but V is not randomly Eulerian.

Then there is a non-Eulerian ...

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