concept formulation
1.First, a new reference tree-group method is proposed using the concept of reference tree-group (RTG) and the formulation of decomposition of identical drop order of the determinant (DIDO). Then, the method of counting the transposition coefficients of complete and incomplete graph is discussed. Finally, the DIDORTG is compared with other methods for finding the tree-set of linear graphs.
2.In this paper , through analysis of agent cooperation connection in DDSS ,a new concept of agent cooperation group is proposed, also analysis how to composed the agent cooperation group; at the same time, through example and formulation description, the agent cooperation group compose and its arithmetic is gave.
3.By analysis of multi-agent arrange mechanism in DDSS,the concept of arrange-alliance on MAS is expatiated and the construction of arrange-alliance is explained. At the same time,the arithmetic of arrange-alliance is described with formulation.

