Graph details

Graph # 34259

Adjacency matrix

[Too large to display]

Adjacency list

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HoG graph id


Graph name

Most Maximum Matchings Tree 28

Graph submitted by

Kevin Ryde

Invariant values

The definitions of the invariants can be found here.
Invariant Value Invariant Value
Acyclic Yes Index 2.436
Algebraic Connectivity 0.038 Laplacian Largest Eigenvalue 5.536
Average Degree 1.929 Longest Induced Cycle undefined
Bipartite Yes Longest Induced Path 10
Chromatic Index 4 Matching Number 8
Chromatic Number 2 Maximum Degree 4
Circumference undefined Minimum Degree 1
Claw-Free No Minimum Dominating Set 8
Clique Number 2 Number of Components 1
Connected Yes Number of Edges 27
Density 0.071 Number of Triangles 0
Diameter 10 Number of Vertices 28
Edge Connectivity 1 Planar Yes
Eulerian No Radius 5
Genus 0 Regular No
Girth undefined Second Largest Eigenvalue 2.236
Hamiltonian No Smallest Eigenvalue -2.436
Independence Number 20 Vertex Connectivity 1

A table row rendered like this indicates that the graph is marked as being interesting for that invariant.


Posted by Kevin Ryde at Feb 5, 2020 7:27 AM.
Heuberger and Wagner determine trees of n vertices with the most maximum matchings and show there is a unique such tree (except two each at n=6 and n=34). The present tree is n=28. It has 8280 maximum matchings (of size matchnum 8).

Clemens Heuberger and Stephan Wagner, "The Number of Maximum Matchings In a Tree", Discrete Mathematics, volume 311, issue 21, November 2011, pages 2512-2542.

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