This paper focuses on factors influencing grassland lease, which will contribute to the heated debate about land use in China by extending to more extensive and vulnerable grassland regions. Based on review of grassland institutional change and analysis of data from 12 villages, this paper...

The past few years have witnessed the great success of recommender systems, which can significantly help users to find out personalized items for them from the information era. One of the widest applied recommendation methods is the Matrix Factorization (MF). However, most of the researches on...

Two theorems (announced by Topkis) about topological description of a sublattice are proved. They are applied to extend some classical results (due to Topkis and Zhou, etc.) concerning the existence and the order structure of Nash equilibria of a supermodular game, with some problems in Zhou’s...