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67 where is the indicator function of . Letting leads to the contradiction ( ) ( ) . This completes the proof of the theorem. REFERENCES: 1. Beddington J. R. Mutual interference between parasites or predators and its effect on searching efficiency. Journal of Animal Ecology, 1975. Vol. 44, P. 331 – 340. 2. DeAngelis D. L., Goldstein R. A., O’neil R. V. A model of trophic interaction. Ecology, 1975. Vol. 56, P. 881 – 892. 3. Gikhman I. I., Skorokhod A. V., Stochastic Differential Equations and its Applications. Kyiv: Naukova Dumka, 1982. 611 p.