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Irregularity of Graphs respecting Degree Bounds

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arxiv 2303.12632 v1 pith:SJGTIROO submitted 2023-03-22 math.CO

classification math.CO
keywords deltadegreefracgraphirregularityleftrightalbertson
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abstract

Albertson defined the irregularity of a graph $G$ as $irr(G)=\sum\limits_{uv\in E(G)}|d_G(u)-d_G(v)|$. For a graph $G$ with $n$ vertices, $m$ edges, maximum degree $\Delta$, and $d=\left\lfloor \frac{\Delta m}{\Delta n-m}\right\rfloor$, we show $$irr(G)\leq d(d+1)n+\frac{1}{\Delta}\left(\Delta^2-(2d+1)\Delta-d^2-d\right)m.$$

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