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Bipartite graphs with minimum degree at least 15 are anti...
Kecai Deng · 2025-07-23 · via math.CO updates on arXiv.org

An antimagic {labeling} of a graph $G=(V,E)$ is a one-to-one mapping $f: E\rightarrow\{1,2,\ldots,|E|\}$, ensuring that the vertex sums in $V$ are pairwise distinct, where a vertex sum of a vertex $v$ is defined as the sum of the labels of the edges incident to $v$. A graph is called antimagic if it admits an antimagic labeling. The Antimagic Labeling Conjecture, proposed by Hartsfield and Ringel in 1990, posits that every connected graph other than $K_2$ is antimagic. The conjecture was confirmed for graphs of average degree at least 4,182 in 2016 by Eccles, where it was stated that a similar approach could not reduce the bound below 1,000 from 4,182. This paper shows that every bipartite graph with minimum degree at least 15 is antimagic. Our approach relies on three tools: a consequence of König's Theorem, the existence of a subgraph of a specific size that avoids Eulerian components, and a labeling lemma that ensures some vertex sums are divisible by three while others are not.