Edge-localized Turán inequality for the signless Laplacian spectral radius

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Let GG) be a connected graph, let E(G)E(G) be its edge set, let deg⁡(u)\deg(u) denote the degree of a vertex uu, let q(G)q(G) denote the spectral radius of the signless Laplacian of GG, and let c(uv)c(uv) denote the relevant clique parameter associated with the edge uvuv. Edge-localized Turán conjecture. For any connected graph GG,

q(G)≤2∑uv∈E(G)(1−1c(uv))(1deg⁡(u)+1deg⁡(v)).q(G)\le 2\sum_{uv\in E(G)}\left(1-\frac{1}{c(uv)}\right)\left(\frac{1}{\deg(u)} + \frac{1}{\deg(v)}\right).

This is proposed as an edge-localized analogue of a Turán-type inequality for the signless Laplacian. The supplied text does not state whether the conjecture has been resolved.

References

Primary source

M. Rajesh Kannan, Hitesh Kumar and Shivaramakrishna Pragada, “Localized Turán-type inequalities for Q-index”, arXiv:2605.23283 (2026).

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