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Angsheng Li, Yicheng Zhao. Plus cupping degrees do not form an ideal. Science in China Series F: Information Sciences, 47(5):635-654, 2004. [doi]
Possibly Related PublicationsThe following publications are possibly variants of this publication: A hierarchy for the plus cupping Turing degreesYong Wang, Angsheng Li. JSYML, 68(3):972-988, 2003. A minimal pair joining to a plus cupping Turing degreeDengfeng Li, Angsheng Li. mlq, 49(6):553-566, 2003. [doi] Universal Cupping DegreesAngsheng Li, Yan Song, Guohua Wu. tamc 2006: 721-730 [doi]
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