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^{p}+\\cdots+\\left\\vert x_{n}\\right\\vert ^{p}=1\\right\\} . \\] The most remarkable feature of $\\lambda^{\\left( p\\right) }$ is that it seamlessly joins several other graph parameters, e.g., $\\lambda^{\\left( 1\\right) }$ is the Lagrangian, $\\lambda^{\\left( 2\\right) }$ is the spectral radius and $\\lambda^{\\left( \\infty\\right) }/2$ 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