Q-INTEGRAL EQUATIONS OF FRACTIONAL ORDERS. 1. Introduction In this paper, we are concerned with the following functional equation
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1 Electronic Journal of Differential Equations, Vol , No. 17, pp ISSN: URL: or ftp ejde.math.txstate.edu Q-INTEGRAL EQUATIONS OF FRACTIONAL ORDERS MOHAMED JLELI, MOHAMMAD MURSALEEN, BESSEM SAMET Abstract. The aim of this paper is to study the existence of solutions for a class of q-integral equations of fractional orders. The techniques in this work are based on the measure of non-compactness argument and a generalized version of Darbo s theorem. An example is presented to illustrate the obtained result. 1. Introduction In this paper, we are concerned with the following functional equation ft, xbt xt = F t, xat, t qs α 1 us, xs d q s, t I, 1.1 where α > 1, q, 1, I = [, 1], f, u : [, 1] R R, a, b : I I and F : I R R R. Equation 1.1 can be written as xt = F t, xat, ft, xbti α q u, x t, t I, where I α q is the q-fractional integral of order α defined by see [1] I α q ht = 1 t qs α 1 hs d q s, t [, 1]. Using a measure of non-compactness argument combined with a generalized version of Darbo s theorem, we provide sufficient conditions for the existence of at least one solution to 1.1. We present also some examples to illustrate our obtained result. The measure of non-compactness argument was used by several authors to study the existence of solutions for various classes of integral equations. As examples, we refer the reader to Aghajani et al [2, 4, 5], Banaś et al [1, 14, 15], Banaś and Goebel [11], Banaś and Rzepka [16], Banaś and Martinon [12], Caballero et al [2, 21, 22], Darwish [25], Çakan and Ozdemir [23], Dhage and Bellale [28], Mursaleen and Mohiuddine [39], Mursaleen and Alotaibi [37], and the references therein. For other applications of the measure of non-compactness concept, we refer to [13, 38]. 21 Mathematics Subject Classification. 31A1, 26A33, 47H8. Key words and phrases. q-fractional integral; existence; measure of non-compactness. c 216 Texas State University. Submitted October 2, 215. Published January 8,
2 2 M. JLELI, M. MURSALEEN, B. SAMET EJDE-216/17 In [24], via a measure of non-compactness concept, Darwish obtained an existence result for the singular integral equation yt = ft + yt Γα The above equation can be written in the form us, ys ds, t [, 1], α >. t s 1 α yt = ft + yti α u, y t, t [, 1], where I α is the Riemann-Liouville fractional integral of order α defined by see [41] I α ht = 1 hs ds, t [, 1]. Γα t s 1 α Following the above work, there has been a great interest in the study of functional equations involving fractional integrals. In this direction, we refer the reader to [3, 19, 26, 27, 17, 18, 29] and the references therein. The concept of q-calculus quantum calculus was introduced by Jackson see [33, 34]. This subject is rich in history and has several applications see [3, 35]. Fractional q-difference concept was initiated by Agarwal and by Al-Salam see [1, 7]. Because of the considerable progress in the study of fractional differential equations, a great interest appeared from many authors in studying fractional q- difference equations see for examples [6, 7, 31, 32, 36] and the references therein. The paper is organized as follows. In Section 2, we fix some notations that will be used through this paper, we recall some basic tools on q-calculus and we collect some basic definitions and facts on the measure of non-compactness concept. In Section 3, we state and prove our main result. Next, we present an illustrative example. 2. Preliminaries At first, we recall some concepts on fractional q-calculus and present additional properties that will be used later. For more details, we refer to [1, 8, 4]. Let q be a positive real number such that q 1. For x R, the q-real number [x] q is defined by [x] q = 1 qx 1 q. The q-shifted factorial of real number x is defined by k 1 x, q = 1, x, q k = 1 xq i, k = 1, 2,...,. i= For x, y R 2, the q-analog of x y k is defined by k 1 x y = 1, x y k = x q i y, k = 1, 2,... For β R, x, y R 2 and x, i= x y β = x β i= x yq i x yq β+i. Note that if y =, then x β = x β. The following inequality see [31] will be used later.
3 EJDE-216/17 Q-INTEGRAL EQUATIONS OF FRACTIONAL ORDERS 3 Lemma 2.1. If β > and a b t, then The q-gamma function is given by Γ q x = We have the following property t b β t a β. 1 qx 1, x {, 1, 2,... }. 1 q x 1 Γ q x + 1 = [x] q Γ q x. Let f : [, b] R b > be a given function. The q-integral of the function f is given by I q ft = fs d q s = t1 q ftq n q n, t [, b]. If c [, b], we have b c fs d q s = b n= fs d q s c fs d q s. Lemma 2.2. If f : [, 1] R is a continuous function, then fs d q s fs d q s, t [, 1]. Note that in general, if t 1 t 2 1 and f : [, 1] R is a continuous function, the inequality 2 fs d q s 2 fs d q s t 1 is not satisfied. We remark that in many papers dealing with q-difference boundary value problems, the use of such inequality yields wrong results. As a counterexample, we refer the reader to [8, Page.12]. Let f : [, 1] R be a given function. The fractional q-integral of order α of the function f is given by Iq ft = ft and I α q ft = 1 Note that for α = 1, we have t 1 t qs α 1 fs d q s, t [, 1], α >. I 1 q ft = I q ft, t [, 1]. If f 1, then Iq α 1 1t = Γ q α + 1 tα, t [, 1]. Now, we recall the notion of measure of non-compactness, which is the main tool used in this paper. Let E be a Banach space over R with respect to a certain norm. We denote by B E the set of all nonempty and bounded subsets of E. A mapping σ : B E [, is a measure of non-compactness in E see [13] if the following conditions are satisfied: i for all M B E, we have σm = implies M is precompact;
4 4 M. JLELI, M. MURSALEEN, B. SAMET EJDE-216/17 ii for every pair M 1, M 2 B E B E, we have iii for every M B E, M 1 M 2 = σm 1 σm 2 ; σm = σm = σcom, where com denotes the closed convex hull of M; iv for every pair M 1, M 2 B E B E and λ, 1, we have σλm λm 2 λσm λσm 2 ; v if {M n } is a sequence of closed and decreasing w.r.t sets in B E such that σm n as n, then M := n=1m n is nonempty. Let Λ be the set of functions η : [, [, such that 1 η is a non-decreasing function; 2 η is an upper semi-continuous function; 3 ηs < s, for all s >. For our purpose, we need the following generalized version of Darbo s theorem see [2]. Lemma 2.3. Let D be a nonempty, bounded, closed and convex subset of a Banach space E. Let T : D D be a continuous mapping such that σt M ησm, M D, where η Λ and σ is a measure of non-compactness in E. Then T has at least one fixed point. Lemma 2.4. Let η 1, η 2 Λ and τ, 1. Then the function γ : [, [, defined by γt = max{η 1 t, η 2 t, τ t}, t belongs to the set Λ. Proof. Let t, s R 2 be such that t s. Since η 1, η 2 are non-decreasing and τ, 1, we have η i t η i s γs, i = 1, 2, τt τs γs, which yield γt γs. Therefore, γ is a non-decreasing function. Now, for all s >, we have η i s < s for i = 1, 2 and τ s < s. Since γs {η 1 s, η 2 s, τ s}, we obtain γs < s, s >. On the other hand, it is well-known that the maximum of finitely many upper semi-continuous functions is upper semi-continuous. As consequence, the function γ belongs to the set Λ. In what follows let E = CI; R be the set of real and continuous functions in the compact set I. It is well-known that E is a Banach space with respect to the norm x = max{ xt : t I}, x E.
5 EJDE-216/17 Q-INTEGRAL EQUATIONS OF FRACTIONAL ORDERS 5 Now, let M B E be fixed. For x, ρ M,, we denote by ωx, ρ the modulus of continuity of x; that is, ωx, ρ = sup{ xt 1 xt 2 : t 1, t 2 I I, t 1 t 2 ρ}. Further on let us define Define the mapping σ : B E [, by ωm, ρ = sup{ωx, ρ : x M}. σm = lim ρ + ωm, ρ, M B E. Then σ is a measure of non-compactness in E see [11]. 3. Main result Define the operator T on E = CI; R by ft, xbt t T xt = F t, xat, t qs α 1 us, xs d q s, x, t E I. We consider the assumption A1 The functions f, u : [, 1] R R, a, b : I I and F : [, 1] R R R are continuous. Proposition 3.1. Under assumption A1, the operator T maps E into itself. Proof. From assumption A1, we have just to show that the operator H defined on E by Hxt = t qs α 1 us, xs d q s, x, t E I 3.1 maps E into itself. To do this, let us fix x E. For all t I, we have Hxt = = t1 q t qs α 1 us, xs d q s = t α 1 q q n t q n+1 t α 1 utq n, xtq n n= q n 1 q n+1 α 1 utq n, xtq n. n= On the other hand, since < q n+1 < 1, using Lemma 2.1, we have 1 q n+1 α 1 1 α 1 = 1. Then by the continuity of u and using the Weierstrass convergence theorem, we obtain the desired result. We consider also the following assumptions. A2 There exist a constant C F > and a non-decreasing function ϕ F : [, [, such that F t, x, y F t, z, w ϕ F x z +C F y w, t, x, y, z, w I R R R R. A3 There exists a constant C f > such that ft, x ft, y C f x y, t, x, y I R R.
6 6 M. JLELI, M. MURSALEEN, B. SAMET EJDE-216/17 A4 There exists a non-decreasing and continuous function ϕ u : [, [, such that ut, x ut, y ϕ u x y, t, x, y I R R, ϕ u t < t, t >, A5 There exists r > such that where ut, =, t I. ϕ F r + F + C F C f r + f ϕ u r Γ q α + 1 r, F = max{ F t,, : t I} and f = max{ ft, : t I}. Let the closed ball of center and radius r be denote by B, r = {x E : x r }. Proposition 3.2. Under assumptions A1 A5, the operator T maps B, r into itself. Proof. Let x B, r. Using the considered assumptions, for all t I, we have T xt ft, xbt F t, xat, + F t,, ϕ F xat + C F ft, xbt t qs α 1 us, xs d q s F t,, ft, xbt ft, + ft, ϕ F x + C F Therefore, t qs α 1 us, xs d q s + F ϕ F x + C F C f xbt + f ϕ u x t qs α 1 us, xs d q s + F C f x + f ϕ u x ϕ F x + C F t α + F Γ q α + 1 C f r + f ϕ u r ϕ F r + C F + F. Γ q α + 1 T x ϕ F r + C F C f r + f ϕ u r Γ q α + 1 t qs α 1 d q s + F + F, x B, r. Using the above inequality and assumption A5, we obtain the desired result. Proposition 3.3. Under assumptions A1 A5, the operator T maps continuously B, r into itself. Proof. Define the operators γ 1, γ 2 and γ 3 on E by γ 1 xt = t, x, t E I, γ 2 xt = xat, x, t E I,
7 EJDE-216/17 Q-INTEGRAL EQUATIONS OF FRACTIONAL ORDERS 7 γ 3 xt = ft, xbt, x, t E I. Obviously, γ 1 : E E is continuous. Moreover, for all x, y E, we have which implies that γ 2 xt γ 2 yt = xat yat x y, t I, γ 2 x γ 2 y x y, x, y E E. Therefore, γ 2 is uniformly continuous on E. Similarly, for all x, y E, for all t I, we have γ 3 xt γ 3 yt = ft, xbt ft, ybt C f xbt ybt C f x y, which implies γ 3 x γ 3 y C f x y, x, y E E. Then γ 3 is also uniformly continuous on E. So, in order to prove that T is continuous on B, r, we only need to show that the operator H defined by 3.1 is continuous on B, r. To do this, let us consider ε > and x, y B, r B, r such that x y ε. For all t I, we have Hxt Hyt = Set = t qs α 1 us, xs d q s t qs α 1 us, xs us, ys d q s. t qs α 1 us, ys d q s u r ε = sup{ ut, x ut, y : t I, x, y [ r, r ] [ r, r ], x y ε}, we obtain for all t I. Therefore, Hxt Hyt tα u r ε u r ε, Hx Hy u r ε. Passing to the limit as ε + and using the uniform continuity of u on the compact set I [ r, r ], we obtain u r ε lim =, ε + which completes the proof. To prove our main result, the following additional assumptions are needed. A6 The function ϕ F : [, [, is continuous and it satisfies ϕ F s < s for s >. A7 The function a : I I satisfies at as ϕ a t s, t, s I I, where ϕ a : [, [, is non-decreasing and lim t + ϕ a t =. A8 The function b : I I satisfies bt bs ϕ b t s, t, s I I, where ϕ b : [, [, is non-decreasing and lim t + ϕ b t =.
8 8 M. JLELI, M. MURSALEEN, B. SAMET EJDE-216/17 A9 We suppose that < ϕ u r < Γ qα + 1 C F C f Our main result is the following. and C F C f r + f < 1. Theorem 3.4. Under assumptions A1 A9, Equation 1.1 has at least one solution x CI; R satisfying x r. Proof. From Proposition 3.3, we know that T : B, r B, r is a continuous operator. Now, let M be a nonempty subset of B, r. Let ρ >, x M and t 1, t 2 I I be such that t 1 t 2 ρ. Without restriction of the generality, we may assume that t 1 t 2. We have T xt 1 T xt 2 = F t 1, xat 1, ft 1, xbt 1 F t 2, xat 2, ft 2, xbt 2 F t 1, xat 1, ft 1, xbt 1 F t 2, xat 1, ft 1, xbt 1 + F t 2, xat 1, ft 1, xbt 1 F t 2, xat 2, ft 2, xbt 2 = I + II Estimate for I. We have ft 1, xbt 1 t1 t 1 qs α 1 us, xs d q s Set ft 1, xbt 1 1 t 1 qs α 1 us, xs d q s ft 1, xbt 1 ft 1, + ft 1, C f xbt 1 + f ϕ u x t α 1 Γ q α + 1 C f x + f ϕ u x Γ q α + 1 C f r + f ϕ u r = D. Γ q α + 1 t 1 qs α 1 us, xs d q s t 2 qs α 1 us, xs d q s t 1 qs α 1 us, xs d q s t 1 qs α 1 us, xs d q s t 1 qs α 1 us, xs d q s t 2 qs α 1 us, xs d q s 1 t 1 qs α 1 ϕ u xs d q s CF, δ = sup { F t, x, y F s, x, y : t, s I I, t s ρ, x [ r, r ], y [ D, D] }, 3.2
9 EJDE-216/17 Q-INTEGRAL EQUATIONS OF FRACTIONAL ORDERS 9 we obtain Estimate for II. We have On the other hand, which yields Now, we have Then Let us define I CF, δ. 3.3 II ϕ F xat 1 xat 2 + C 1 F ft 1, xbt 1 t 1 qs α 1 us, xs d q s 2 ft 2, xbt 2 t 2 qs α 1 us, xs d q s. xat 1 xat 2 ωx a, ρ, ϕ F xat 1 xat 2 ϕ F ωx a, ρ. ft 1, xbt 1 1 ft 2, xbt 2 ft 1, xbt 1 ft 2, xbt 2 t 1 qs α 1 us, xs d q s ft 2, xbt 2 ft 2, xbt t 2 qs α 1 us, xs d q s t 1 qs α 1 us, xs d q s t 1 qs α 1 us, xs d q s t 1 qs α 1 us, xs d q s t 2 qs α 1 us, xs d q s ft 1, xbt 1 ft 2, xbt 2 ϕ u x 1 + ft 2, xbt 2 t 1 qs α 1 us, xs d q s 2 t 2 qs α 1 us, xs d q s = III + IV. ω f r, ρ = sup{ ft, x fs, x : t, s I I, t s ρ, x [ r, r ]}. III ϕ u x ft 1, xbt 1 ft 1, xbt 2 + ϕ u x ft 1, xbt 2 ft 2, xbt 2 [C f xbt 1 xbt 2 + ω f r, ρ] ϕ u r
10 1 M. JLELI, M. MURSALEEN, B. SAMET EJDE-216/17 [C f ωx b, ρ + ω f r, ρ] ϕ u r. Now, let us estimate IV. At first, we have ft 2, xbt 2 ft 2, xbt 2 ft 2, + ft 2, Next, we have 1 t 1 qs α 1 us, xs d q s = 1 q We can write where and C f xbt 2 + f C f r + f. 2 t 2 qs α 1 us, xs d q s q n 1 q n+1 α 1 t α 1 uq n t 1, xq n t 1 t α 2 uq n t 2, xq n t 2. n= t α 1 uq n t 1, xq n t 1 t α 2 uq n t 2, xq n t 2 t α 1 uq n t 1, xq n t 1 uq n t 1, xq n t 2 + t α 1 uq n t 1, xq n t 2 t α 2 uq n t 2, xq n t 2 ϕ u xq n t 1 xq n t 2 + A ρ ϕ u ωx, ρ + A ρ, A ρ = sup { N τ, s, x N τ, s, x : τ, s, τ, s I 4, τ τ ρ, s s ρ, x [ r, r ] } N τ, s, x = τ α us, x, τ, s, x I I R. Then, we obtain 1 t 1 qs α 1 us, xs d q s ϕ u ωx, ρ + A ρ. As consequence, we have 2 t 2 qs α 1 us, xs d q s IV C f r + f ϕ u ωx, ρ + A ρ. Using the above inequalities, we obtain II ϕ F ωx a, ρ + C F [Cf ωx b, ρ + ω f r, ρ]ϕ u r + C f r + f ϕ u ωx, ρ + A ρ. Now, observe that from assumption A7, we have ωx a, ρ = sup{ xat xas : t, s I I, t s ρ} sup{ xµ xν : µ, ν I I, µ ν ϕ a ρ} = ωx, ϕ a ρ. Similarly, from assumption A8, we have ωx b, ρ ωx, ϕ b ρ.
11 EJDE-216/17 Q-INTEGRAL EQUATIONS OF FRACTIONAL ORDERS 11 Then II ϕ F ωx, ϕ a ρ + C F [Cf ωx, ϕ b ρ + ω f r, ρ]ϕ u r + C f r + f ϕ u ωx, ρ + A ρ. 3.4 Next, using 3.2, 3.3 and 3.4, we obtain ωt x, ρ CF, δ + ϕ F ωx, ϕ a ρ + C F [Cf ωx, ϕ b ρ + ω f r, ρ]ϕ u r + C f r + f ϕ u ωx, ρ + A ρ, which yields ωt M, ρ CF, δ + ϕ F ωm, ϕ a ρ + C F [Cf ωm, ϕ b ρ + ω f r, ρ]ϕ u r + C f r + f ϕ u ωm, ρ + A ρ. Recall that from assumptions A7 A8, we have lim ϕ at = lim ϕ bt =. ρ + ρ + Then passing to the limit as ρ + in the above inequality, we obtain σt M ϕ F σm + C F Cf σmϕ u r + C f r + f ϕ u σm. Therefore, where σt M ησm, ηt = max{ϕ F t, Lϕ u t, Nt}, t, with L = C F C f r + f, N = C F C f Γ q α + 1 ϕ ur. From assumption A9 and Lemma 2.4, the function η belongs also to the set Λ. Finally, applying Lemma 2.3, we obtain the existence of at least one fixed point of the operator T in B, r, which is a solution to 1.1. We end the paper with the following illustrative example. Consider the integral equation xt = t 32 + xt 4 + [α] t q 2 + xt 4 t qs α 1 xs 2 + s 2 d qs, 3.5 for t I = [, 1], where α > 1 and q, 1. Observe that 3.5 can be written in the form 1.1, where at = t, t I, bt = t, t I, F t, x, y = t 32 + x 4 + Γ qα + 1y, t, x, y I R R, ft, x = t 2 + x, t, x I R, 4
12 12 M. JLELI, M. MURSALEEN, B. SAMET EJDE-216/17 ut, x = x 2 + t 2, t, x I R. Now, let us check that the required assumptions by Theorem 3.4 are satisfied. Assumption A1. It is trivial. Assumption A2. For all t, x, y, z, w I R R R R, we have F t, x, y F t, z, w = x 4 + Γ qα + 1y z 4 Γ qα + 1w x z + Γ q α + 1 y w. 4 Then assumption A2 is satisfied with ϕ F t = t 4, t, C F = Γ q α + 1. Assumption A3. For all t, x, y I R R, we have x y ft, x ft, y =. 4 Then assumption A3 is satisfied with C f = 1 4. Assumption A4. For all t, x, y I R R, we have x y x y ut, x ut, y =. 2 + t2 2 Take ϕ u t = t 2, t, assumption A4 holds. Assumption A5. At first, in our case, we have F = 1 32 and f = 1 2. Now, the inequality ϕ F r + F + C F C f r + f ϕ u r r Γ q α + 1 is equivalent to r 2 4r The above inequality is satisfied for any r [ 4 15 Assumptions A6 A8 are trivial. Assumption A9. The inequality < ϕ u r < Γ qα + 1 C F C f is equivalent to < r < 8. The inequality C F C f r + f < 1 is equivalent to r < 4 2. A simple computation gives us that [ , ]., ] 4, 2 2 for α = 3/2 and q = 1/2. Therefore, all the assumptions A1 A9 are satisfied for α = 3/2 and q = 1/2. By Theorem 3.4, we have the following result.
13 EJDE-216/17 Q-INTEGRAL EQUATIONS OF FRACTIONAL ORDERS 13 Theorem 3.5. For α, q = 3/2, 1/2, Equation 3.5 has at least one solution x CI; R. Acknowledgements. The first and third authors would like to extend their sincere appreciation to the Deanship of Scientific Research at King Saud University for its funding of this research through the International Research Group Project no. IRG14-4. References [1] R. P. Agarwal; Certain fractional q-integrals and q-derivatives, Proc. Cambridge Philos. Soc., , [2] A. Aghajani, R. Allahyari, M. Mursaleen; A generalization of Darbo s theorem with application to the solvability of systems of integral equations, J. Comput. Appl. Math., , [3] A. Aghajani, J. Banaś, Y. Jalilian; Existence of solutions for a class of nonlinear Volterra singular integral equations, Comput. Math. Appl., , [4] A. Aghajani, M. Mursaleen, A. Shole Haghighi; Fixed point theorems for Meir-Keeler condensing operators via measure of noncompactness, Acta Math. Sci., 35 B 3 215, [5] A. Aghajani, E. Pourhadi, J.J. Trujillo; Application of measure of noncompactness to a Cauchy problem for fractional differential equations in Banach spaces, Fract. Calc. Appl. Anal., , [6] B. Ahmad, J. Nieto; Basic theory of nonlinear third-order q-difference equations and inclusions, Math. Model. Anal., , [7] W. Al-Salam; Some fractional q-integrals and q-derivatives, Proc. Edinb. Math. Soc., /1967, [8] M. H. Annaby, Z. S. Mansour; q-fractional calculus and equations, Lecture Notes in Mathematics 256, Springer-Verlag, Berlin, 212. [9] F. Atici, P. Eloe; Fractional q-calculus on a time scale, J. Nonlinear Math. Phys., , [1] J. Banaś, J. Caballero, J. Rocha, K. Sadarangani; Monotonic solutions of a class of quadratic integral equations of Volterra type, Comput. Math. Appl., 49 25, [11] J. Banaś, K. Goebel; Measures of Noncompactness in Banach Spaces, in: Lecture Notes in Pure and Applied Mathematics, vol. 6, Marcel Dekker, New York and Basel, 198. [12] J. Banaś, A. Martinon; Monotonic solutions of a quadratic integral equation of Volterra type, Comput. Math. Appl., 47 24, [13] J. Banaś, M. Mursaleen; Sequence Spaces and Measures of Noncompactness with Applications to Differential and Integral Equations, Springer, New Dehli, 214. [14] J. Banaś, M. Lecko, W.G. El-Sayed; Existence theorems of some quadratic integral equations, J. Math. Anal. Appl., , [15] J. Banaś, J. Rocha, K. Sadarangani; Solvability of a nonlinear integral equation of Volterra type, J. Comput. Appl. Math., , [16] J. Banaś, B. Rzepka; On existence and asymptotic stability of solutions of a nonlinear integral equation, J. Math. Anal. Appl., , [17] J. Banaś, B. Rzepka; Monotonic solutions of a quadratic integral equation of fractional order, J. Math. Anal. Appl., , [18] J. Banaś, D. O Regan; On existence and local attractivity of solutions of a quadratic integral equation of fractional order, J. Math. Anal. Appl., , [19] M. Benchohra, D. Seba; Integral equations of fractional order with multiple time delays in banach spaces, Electron. J. Differential Equations, , 1 8. [2] J. Caballero, B. López, K. Sadarangani; On monotonic solutions of an integral equation of Volterra type with supremum, J. Math. Anal. Appl., 35 25, [21] J. Caballero, B. López, K. Sadarangani; Existence of nondecreasing and continuous solutions for a nonlinear integral equation with supremum in the kernel, Z. Anal. Anwend., 26 27, [22] J. Caballero, J. Rocha, K. Sadarangani; On monotonic solutions of an integral equation of Volterra type, J. Comput. Appl. Math., ,
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