On the distance spectra of several double neighbourhood corona 
Received:May 15, 2018 Revised:November 28, 2018 
Key Word:
corona distance spectrum double neighbourhood corona super neighbourhood corona distance matrix.

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Abstract: 
Let G be a connected graph of order n and D(G) be its distance matrix. The
distance eigenvalues of G are the eigenvalues of its distance matrix and they form together
with their multiplicities the distance spectrum of G. In this article, we give a complete
description of the eigenvalues and the corresponding eigenvectors of super neighbourhood
corona distance matrix . Further, we give a complete description of the eigenvalues and the
corresponding eigenvectors of distance matrix of double neighbourhood corona , when G is a complete graph and G1, G2 is a regular graph. 
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