Abstract
The boundary value problem is considered. The function f is assumed to be continuous on [a, b]× R2, and g 1 and g 2 are assumed to be continuous and nondecreasing on R. The condition (A)There exists M 1 >0 and a positive, continuous function Ψ(p) defined on [0, ∞) such that and for , is used to obtain an a priori bound on solutions, As applications of the a priori bound, an existence theorem is obtained using the Leray-Schauder Theorem, and a “weak continuous dependence theorem” is proved, In both cases, the well-known Nagumo condition is also imposed in order to obtain a priori bounds on derivatives of solutions.

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