The grey number decision making based on TOPSIS and subordinate function;

Using grey number to express decision information is reasonable.

Two kinds of discrete grey numbers whose whiting may be consistent (or opposite) and should be consistent in order (or opposite in order) were defined, and their relationship was pointed out.

Based on the general dynamic programming,in the grey dynamic programming model combined with the grey theory,the runoff is described by the interval grey numbers.

Based on grey idea and game theory,this paper analyzes uncertain factors on conflicted vehicles at the entrances of expressways,presents that the conflicted vehicles when choosing strategies are restrained by interval grey numbers,and establishes zero and grey game model for conflicted vehicles.

A kind of order relations of interval grey number via kenning degree;

Aiming at the defects of the traditional fuzzy synthetic judging method,the method for carrying out evaluation on the scheme of mechanical design by the use of Vague set and interval grey number was presented.

The conceptions of the superiority,inferiority and equipollence position degrees of the interval grey number were defined,and it was proved that the sum of three position degrees for a certain interval grey number related to another grey number is 1,and that the relation set of the position degrees is a whole order set of the in.