How to find the isomorphism between two graphs while the other is not

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It seems very difficult for me to find out the isomorphism because I cannot even determine which two of them are isomorphic

  • $\begingroup$ Please make your question self-contained. $\endgroup$ – Qudit Oct 23 '17 at 23:38
  • $\begingroup$ In general finding isomorphisms is not an easy problem. You need a systematic approach; if you have not been given any process then hopefully this will encourage you to find something. $\endgroup$ – Joffan Oct 23 '17 at 23:51


Each graph has $6$ vertices with a degree of $3$ and $3$ vertices with a degree of $4$. So, since there are fewer of the latter, start by focusing on the three vertices with degree $4$, see how they are related to each other, and go from there.


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