Euler's path same as Hamiltonian cycle

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Homework Help Overview

The problem involves classifying graphs with n vertices where the Euler's path coincides with the Hamiltonian cycle. Participants are exploring the relationship between these two concepts in graph theory.

Discussion Character

  • Conceptual clarification, Assumption checking, Exploratory

Approaches and Questions Raised

  • One participant suggests that regular graphs with a degree greater than n/2 may have both an Euler's path and a Hamiltonian cycle, but questions whether they are the same. Another participant emphasizes the strong condition that a path covering each vertex once must also cover each edge once, leading to a discussion about the necessary characteristics of such graphs. A third participant proposes that only the Cycle Graph meets the criteria.

Discussion Status

The discussion is ongoing, with various interpretations being explored. Some participants are questioning the definitions and conditions necessary for the graphs in question, while others are suggesting tools to visualize and analyze the graphs.

Contextual Notes

Participants are considering the implications of Dirac's Theorem and the specific requirements for a graph to have both an Euler's path and a Hamiltonian cycle that are identical. There is an acknowledgment of the potential limitations in identifying all such graphs.

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Homework Statement


Find (classify) all graphs with n vertices who's Euler's path is the same as their Hamiltonian cycle.

The Attempt at a Solution


I'd say that any regular graphs with a degree greater than n/2 (Dirac's Theorem) with and n divisible by 2 has both and Euler's path and a Hamiltonian cycle. But that doesn't mean they're the same path on that graph. Also that probably does not define all graphs where that's the case.
 
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Think about what each of the definitions mean. It seems that it's a pretty strong condition that a path touching each vertex once also covers each edge once. Specifically, it means the graph needs to have only the edges in the hamiltonian cycle, and no others. See if you can go from here to find a characterization of such graphs.
 
I don't think there are other graphs but the Cycle Graph that meets that criteria :\
 

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