Some Gronwall Type Inequalities and Applications by Sever S. Dragomir

By Sever S. Dragomir

Gronwall style essential inequalities of 1 variable for actual features play a vital position within the Qualitative idea of Differential Equations. the most target of the current examine monograph is to give a few traditional purposes of Gronwall inequalities with non-linear kernels of Lipschitz kind of the issues of boundedness and convergence to 0 at infinity of the suggestions of convinced Volterra vital equations. balance, uniform balance, uniform asymptotic balance and international asymptotic balance homes for trivial answer of sure differential approach of equations also are investigated.

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Some Gronwall Type Inequalities and Applications

Gronwall style imperative inequalities of 1 variable for genuine capabilities play a vital function within the Qualitative concept of Differential Equations. the most goal of the current learn monograph is to offer a few normal purposes of Gronwall inequalities with non-linear kernels of Lipschitz kind of the issues of boundedness and convergence to 0 at infinity of the ideas of definite Volterra necessary equations.

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MORE NONLINEAR GENERALISATIONS 29 Theorem 42 was generalised in another way by. V. Lakshmikantham [68]. R. Beesack [14]. For this result, we shall use the following special notation and terminology. If the function F1 (t, s, u) is defined on I1 × J1 × K1 where each of the symbols represents an interval and if for every (s, u) ∈ J1 × K1 the function f (t) = F1 (t, s, u) is monotone on L1 , we say that F1 (·, s, u) is monotone. We say that F1 and F2 are monotone in the same sense of them being both nondecreasing or both nonincreasing, and monotone in the opposite sense if one is nondecreasing and the other nonincreasing.

1 Some Generalisations In this section we point out some generalisations of the results presented above. The first result is embodied in the following theorem [41]. Theorem 81 Let A, B : [α, β) → [0, ∞), L : [α, β) × [0, ∞) → [0, ∞) be continuous. 28) 50 CHAPTER 2. INEQUALITIES FOR KERNELS OF (L) −TYPE where M is continuous on [α, β) × [0, ∞) and ψ −1 is the inverse mapping of ψ. Then for every nonnegative continuous function x : [α, β) → [0, ∞) satisfying t x (t) ≤ A (t) + ψ B (t) L (s, x (s)) ds , t ∈ [α, β), α we have the estimate t x (t) ≤ A (t) + ψ B (t) t L (u, A (u)) exp α M (s, A (s)) B (s) ds du u for all t ∈ [α, β).

Fi (T, t) = exp 0 j=1 Remark 61 In the special case of this theorem for n = 2, one can get the conclusion for t ∈ I t x (t) ≤ p (t) exp − f1 (t, s) ds 0 t × 1+ s f1 (t, s) exp 0 [2f1 (s, r) + f2 (s, r)] dr ds . 0 In the previous theorems we have had linear inequalities. We now turn to some nonlinear inequalities. B. Pachpatte in [91] and [93] proved the following two theorems. Theorem 62 Let x (t), a (t) and b (t) be real nonnegative and continuous functions on I = [0, ∞) such that t x (t) ≤ x0 + t a (s) x (s) ds + 0 s b (r) xp (r) dr ds, t ∈ I, a (s) 0 0 where x0 is a nonnegative constant and 0 ≤ p ≤ 1.

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