Based on U-system, a new U descriptors is defined, and present the property of U descriptors and its proof.
基于U -系统理论，提出了U描述子的概念，并且给出了U描述子的性质并在理论上予以证明。
Based on U-system, a new U descriptors is defined, and present the property of U descriptors and its proof.
基于U -系统理论，提出了U描述子的概念，并且给出了U描述子的性质并在理论上予以证明。
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