dependency relation
1.The direct dependency graph(DDG),direct dependency matrix(DDM),dependency relation matrix(DRM),degree of direct dependency(DDD) and minimal cover(MC) were defined.
2.Induction dependency relation is an important concept in relational databases research. Automatic discovering minimal induction dependency relation plays an important role in data mining.
3.Ma Jianzhong established“grammatical theory on two levels”in 1898.“The Philosophy of Grammar”by Otto Jesperson is neo-traditional grammar of Europe，and his theory of three ranks is the origin of the dependency relation grammar.
