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 Volume 9, Number 5, 2019, Pages 1940-1947 Existence of nonoscillatory solutions for system of fractional differential equations with positive and negative coefficients Youjun Liu,Huanhuan Zhao,Huiqin Chen,Shugui Kang Keywords:System, fractional differential equation, Liouville derivative, positive and negative coefficients, nonoscillatory solutions. Abstract: In this paper we consider the system of fractional differential equations with positive and negative coefficients. We use the $Banach$ contraction principle to obtain new sufficient conditions for the existence of nonoscillatory solutions. PDF      Download reader