The notions of a C-energetic subset and permeable C-value in BCK-algebras are introduced, and related properties are investigated. Conditions for an element t in [0, 1] to be an permeable C-value are provided. Also conditions for a subset to be a C-energetic subset are discussed. We decompose BCK-algebra by a partition which consists of a C-energetic subset and a commutative ideal.

By comparing the political systems in different dynasties, this book illustrates the continuous evolution of traditional Chinese political systems, and evaluates the merits and demerits of the political systems in different dynasties. It also provides detailed records of the evolved government organizations, the names and functions of various offices, the titles and responsibilities of officials. The book consists of five chapters, each of which focuses on one of the five dynasties respectively -- Han, Tang, Song, Ming, and Qing, and a (...) concluding summary. Combining historical facts and anecdotes from history to make the discussion straightforward, interesting, and easy to understand, this is an ideal book for anyone interested in the history of China, particularly its traditional political systems. (shrink)

1. P'ŭllaetp'om kukka wa sanŏp hyŏngmyŏng iyagi -- 2. Yut'op'ia wa hongik in'gan mohyŏng -- 3. Saeroun pandoch'e munmyŏng ŭl yŏlda -- 4. Han'guk taehyŏngmyŏng i sijak toeŏtta.