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- Chinese Academy of SciencesCN7 papers
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- National Astronomical ObservatoriesCN6 papers
- Xinjiang Astronomical ObservatoryCN6 papers
- Zhejiang Sci-Tech UniversityCN6 papers
- ARC Centre of Excellence for Gravitational Wave DiscoveryAU5 papers
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- Fudan UniversityCN5 papers
- Max Planck Institute for Radio AstronomyDE5 papers
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5 papers · 1 filter
Permutation--invariant Niven numbers
Hui-Ling Wu, S. Y. Lou
This paper introduces permutation-invariant Niven numbers--a novel class of Niven numbers where all digit permutations (with leading zeros automatically ignored) must retain the Ni…
The normality and sum of normalities of trees
Ya-Hong Chen, Hua Wang, Xiao-Dong Zhang
The eccentricity of a vertex in a graph is the maximum distance from to any other vertex. The vertices whose eccentricity are equal to the diameter (the maximum eccentr…
Variations of the eccentricity and their properties in trees
Ya-Hong Chen, Hua Wang, Xiao-Dong Zhang
Motivated from the study of eccentricity, center, and sum of eccentricities in graphs and trees, we introduce several new distance-based global and local functions based on the sma…
On majorization of closed walks vector of trees with given degree sequences
Ya-Hong Chen, Daniel Gray, Ya-Lei Jin +1
Let be the number of the closed walks of length starting at vertex in a tree . We prove that for a given tree degree sequence , then for any tree with de…
Antifactors of regular bipartite graphs
Hongliang Lu, Wei Wang, Juan Yan
Let be a bipartite graph, where and are color classes and is the set of edges of . Lovász and Plummer \cite{LoPl86} asked whether one can decide in polyn…