Abstract
In 2013, Ku and Wong showed that for any partitions μ and μ′ of a positive integer n with the same first part u and the lexicographic order μ◃μ′, the eigenvalues ξμ and ξμ′ of the derangement graph Γn have the property |ξμ|≤|ξμ′|, where the equality holds if and only if u=3 and all other parts are less than 3. In this article, we obtain an analogous conclusion on the eigenvalues of the perfect matching derangement graph M2n of K2n by finding a new recurrence formula for the eigenvalues of M2n.
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