Math Problem Statement

Is this isomorphic

Is this isomorphic

Solution

Yes, the two graphs depicted in the image are isomorphic. Here's why:

  1. Same Number of Vertices: Both graphs have six vertices (u1,u2,u3,u4,u5,u6u_1, u_2, u_3, u_4, u_5, u_6 and v1,v2,v3,v4,v5,v6v_1, v_2, v_3, v_4, v_5, v_6).

  2. Same Number of Edges: Both graphs have the same number of edges. The connections between vertices are equivalent, even if the arrangement looks different.

  3. Preserved Degree Sequence: The degree of each vertex (number of edges connected to it) is preserved between the two graphs:

    • For the left graph (u1u_1, u2u_2, etc.):
      • u1u_1, u2u_2: degree 3.
      • u3u_3, u4u_4, u5u_5, u6u_6: degree 2.
    • For the right graph (v1v_1, v2v_2, etc.):
      • v1v_1, v2v_2: degree 3.
      • v3v_3, v4v_4, v5v_5, v6v_6: degree 2. The degree sequence of the two graphs matches.
  4. One-to-One Correspondence: A mapping exists between vertices of the two graphs that preserves adjacency. For example:

    • u1v1u_1 \leftrightarrow v_1
    • u2v2u_2 \leftrightarrow v_2
    • u3v3u_3 \leftrightarrow v_3
    • u4v4u_4 \leftrightarrow v_4
    • u5v5u_5 \leftrightarrow v_5
    • u6v6u_6 \leftrightarrow v_6
  5. Connectivity Matches: The adjacency of vertices in the two graphs corresponds perfectly after relabeling the vertices.

Thus, the two graphs are isomorphic.


Do you want a detailed proof or specific steps to verify isomorphism? Let me know!

Expanding Questions:

  1. How can we systematically check for graph isomorphism using adjacency matrices?
  2. What are some applications of identifying graph isomorphism in real-world problems?
  3. Could these graphs be representations of a real-world network, like a communication system?
  4. How does the degree sequence help in determining isomorphism?
  5. What algorithms exist for automating the process of verifying graph isomorphism?

Tip: When checking for isomorphism visually, focus on degree sequence and connectivity as initial steps to identify possible mappings.

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Math Problem Analysis

Mathematical Concepts

Graph Theory
Graph Isomorphism

Formulas

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Theorems

Graph Isomorphism Theorem

Suitable Grade Level

Undergraduate Level