Co-Prime Order graph of a finite abelian Group and Dihedral Group

The $\mathbf{\text{Co-Prime}}\mathbf{\text{Order}}\mathbf{\text{Graph}}$ $\mathrm{\Theta }(G)$ of a given finite group is a simple undirected graph whose vertex set is the group $G$ itself, and any two vertexes x,y in $\mathrm{\Theta }(G)$ are adjacent if and only if $gcd(o(x),o(y))=1$ or prime. In this paper, we find a precise formula to count the degree of a vertex in the Co-Prime Order graph of a finite abelian group or Dihedral group $D_n$.We also investigate the Laplacian spectrum of the Co-Prime Order Graph $\mathrm{\Theta }(G)$ when G is finite abelian p-group, ${$\mathbb{Z}$_p}^t \times {$\mathbb{Z}$q}^s$orDihedralgroup$D{p^n}$. Key Words and Phrases: Co-Prime Order graph,finite abelian group,Dihedral group, Laplacian spectrum.