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Let G₁ G₂, G₁ G₂ and G₁ G₂ denote the total corona, Q-vertex corona and Q-edge corona of two graphs G₁ and G₂, respectively. In this paper, we compute the A_-spectrum of G₁ G₂, G₁ G₂ and G₁ G₂ for regular graphs G₁ and G₂. As an application, we construct infinitely many pairs of A_-cospectral graphs.
Najiya et al. (Tue,) studied this question.
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