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In many-valued logic theories, the decision and construction for Sheffer functions is an important problem. The decision for Sheffer functions is interrelated to the decision for completeness of functions set, and the solution can be reduced to determining the minimal coverings of precomplete. It's well known that each precomplete set is a function set,(More)
Nowadays, The present study tries to explore three aspects concerning teacher professional identity construction and answer three questions: 1. How do university EFL teachers in China understand their professional identity? 2. How do university EFL teachers in China construct their professional identity in community of practice? 3. How do the teachers(More)
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