| 摘 要： | In this paper,we reseach the following form of approximate reasoning.Ant 1:(If x1 is A1 and x2 is A2 and… xn is An then y is B)is t1.Ant2:(x1is A'1 and x2is A'2and … and xn is A'n)is t2.Cons:(y is B')is t3.First we put forward two reasonable approximate reasoning principles,then,accordingg to the two reasoning principles we construct a new kind of approximate reasoning methods.The basic idea which the new kind of approximate reasoning methods is that according to the strength p(A1(x),…，An(xn))→B(y)which A1(x1),…,An(xn)implicate B(y) and the degree of A'(x) approximates to A(),we determine the upper limit and B'(y),then take a definite value B'(y) in between the upper limit and the lower limit,and make the reasoning method satisfied the two reasoning principles.
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