Xz. Liu et Dj. Guo, Method of upper and lower solutions for second-order impulsive integro-differential equations in a Banach space, COMPUT MATH, 38(3-4), 1999, pp. 213-223
This paper discusses the initial value problem for second-order nonlinear i
mpulsive integro-differential equations of Volterra type in a Banach space
by means of upper and lower solutions. By establishing a comparison result,
criteria on the existence of maximal and minimal solutions are obtained. (
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