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作品数:18被引量:5H指数:2
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相关领域:理学文化科学更多>>
相关作者:王普更多>>
相关机构:对外经济贸易大学清华大学更多>>
相关期刊:《Acta Mathematicae Applicatae Sinica》《Chinese Annals of Mathematics,Series B》《Science Bulletin》《Journal of Data and Information Science》更多>>
相关基金:国家自然科学基金山西省自然科学基金更多>>
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The Second Neighbourhood for Quasi-transitive Oriented Graphs被引量:2
《Acta Mathematica Sinica,English Series》2018年第9期1391-1402,共12页Rui Juan LI Bin SHENG 
partially supported by NNSFC(Grant No.11401353);TYAL of Shanxi and NSF of Shanxi Province(Grant No.2016011005);partially supported by China Scholarship Council
In 2006, Sullivan stated the conjectures: (1) every oriented graph has a vertex x such that d++ (x) ≥ d- (x); (2) every oriented graph has a vertex x such that d++ (x) + d+ (x) ≥ 2d- (x); (3) ...
关键词:Second neighbourhood quasi-transitive digraphs extended tournaments 
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