The Existence Of Global Solution For Stochastic Functional Differential Equation

Firstly,we discussed stochastic functional Logistic population model(?)where x is population numbers,a > 0, b > 0,if c ? a < 0,we give the existence theory forsolutions.Secondly,we discussed stochastic functional di?erential equations (SFDE)(?)we give the existence of unique global solutions and positive solutions .Finally,we extend the conclusions of the original with theorem in this paper.