EXISTENCE OF MULTIPLE SOLUTIONS TO ELLIPTIC PROBLEMS OF KIRCHHOFF TYPE WITH CRITICAL EXPONENTIAL GROWTH
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1 Electronic Journal of Differential Equations, Vol (2014, o. 107, pp ISS: URL: or ftp ejde.math.txstate.edu EXISTECE OF MULTIPLE SOLUTIOS TO ELLIPTIC PROBLEMS OF KIRCHHOFF TYPE WITH CRITICAL EXPOETIAL GROWTH SAMI AOUAOUI Abstract. In this article, we study elliptic problems of Kirchhoff type in dimension 2, whose nonlinear term has a critical exponential growth. Using variational tools, we establish the existence of at least two nontrivial and nonnegative solutions. 1. Introduction and statement of main results In article, we establish some multiplicity results for the equation A ( u + u ( dx div( u 2 u u 2 u R = B ( F (x, u dx f(x, u + h, in R, 2, R (1.1 where A (, B ( denote the derivatives of two C 1 -functions A( and B( ; f(, : R R [0, + [ is a Carathéodory function such that f is radially symmetric with respect to x, i.e if x, y R satisfy x = y, then f(x, s = f(y, s, for all s R. Moreover, we assume that f(x, t = 0 for all t 0 and all x R ; F (x, u = u 0 f(x, tdt; h : R [0, + [ is some radial function such that h 0 and h L (R with = 1. Kirchhoff-type problems have become a very interesting topic of research in recent years and many papers dealing with such kind of equations were published. We can, for instance; see [4, 9, 10, 11, 12, 13, 14, 37] and references therein. The interest for these problems with various proposed nonlocal terms could be explained by their contributions to modeling many physical and biological phenomena. First, let us mention that quasilinear equations of the model ( M u p dx div ( u p 2 u = f(x, u in Ω, Ω 2000 Mathematics Subject Classification. 35D30, 35J20, 35J61, 58E05. Key words and phrases. Trudinger-Moser inequality; exponential growth; Kirchhoff equation; critical point; energy functional; Ekeland s lemma; Mountain Pass Theorem. c 2014 Texas State University - San Marcos. Submitted December 10, Published April 15,
2 2 S. AOUAOUI EJDE-2014/107 where Ω is a domain of R, is essentially related to the stationary analog of the Kirchhoff equation ( u tt M u 2 u = f(x, t, Ω where M(s = as + b, a, b > 0. This last equation was proposed by Kirchhoff [20] as an extension of the classical D Alembert wave equation for free vibrations of elastic strings. The Kirchhoff model takes into account the length changes of the string produced by transverse vibrations. Later, Lions [26] gave an abstract functional analysis framework to the Kirchhoff model. ext, equations of the model ( M u p dx div ( u p 2 u = f(x, u in Ω, Ω arise in many physical phenomena such as systems of particles in thermodynamical equilibrium via gravitational potential, thermal runaway in ohmic heating, and shear bands in metal deformed under high strain rates. On the other hand, equations of Kirchhoff-type appear in some biological studies; more precisely, such kind of equations could describe the evolution of the density of a population living in some domain Ω. The reader interested in the physical and biological aspects of the Kirchhoff-type problems could be referred to [11, 37]. In the present work, we are interested in the case when the nonlinearity term f(x, s has maximal growth on s which allows us to treat the problem (1.1 variationally. Explicitly, in view of the Trudinger-Moser inequality, we will assume that f satisfies critical growth of exponential type such as f(x, s behaves like exp(α(x s 1 as s +. Elliptic equations involving nonlinearities of exponential growth have been studied by many authors; see, for example [1, 2, 3, 5, 7, 8, 17, 18, 21, 22, 23, 24, 25, 28, 29, 30, 31, 33, 34, 36] and references therein. Studying problems of Kirchhoff-type and involving nonlinearities having a critical exponential growth is a new research subject. Up to our best knowledge, only Figueiredo and Severo [19] studied a problem involving nonlocal terms and a nonlinear term with a critical exponential growth. In [19], the authors studied the problem ( m u 2 dx u = f(x, u in Ω, Ω u = 0 on Ω where Ω is a smooth bounded domain in R 2, m : [0, + [ [0, + [ is some continuous function satisfying that inf t 0 m(t > 0, m(t t is nonincreasing for t > 0, m(t a 1 + a 2 t σ for all t t 0 for some positive constants, a 1, a 2, t 0 and σ, and t+s 0 m(udu t 0 m(udu + s 0 m(udu, s, t 0. Concerning the nonlinear term, the authors assume that f has a critical exponential growth and satisfies that s 0 f(x, tdt K 0f(x, s for all (x, s Ω [s 0, + [ for some positive constants s 0 and K 0. Furthermore, it was assumed that for each f(x,s x Ω, s is increasing for s > 0. This article is a contribution in this new 3 direction. In our paper, we treat a more general problem which is defined in all the space R, 2 and presenting a nonlocal term in the right-hand side of the equation. We will try to adapt some arguments developed in [16]. ow, we state our main hypotheses in this work. (H1 A : [0, + [ R is a C 1 -function satisfying that A(0 = 0 and
3 EJDE-2014/107 EXISTECE OF MULTIPLE SOLUTIOS 3 if s > 0, then A (s > 0, there exist C 0 > 0, α 0 > 0 and s 0 > 0 such that A(s C 0 s α0, 0 s s 0. (H2 B : R R is a C 1 -function satisfying that there exist C 1 > 0, α 1 > 0 and s 1 > 0 such that B(s C 1 s α1, 0 s s 1. (H3 There exist C 2 > 0, α > 1, β > 0 and a bounded radial function γ : R [0, + [ such that for all s 0 and all x R, f(x, s C 2 ( s α + s β( exp ( γ(x s 1 S 2 (γ(x, s, where S 2 (γ(x, s = 2 k=0 (γ(x k k! s k 1. (H4 There exist λ 0 > 0, a 0 > 0, k 0 > 0 and M 0 > 0 such that λ 0 A(s A (ss for all s M 0, A(s k 0 s a0 for all s M 0. (H5 The function B satisfies that there exist λ 1 > 0 and M 1 > 0 such that λ 1 B(s B (ss, s M 1, if s 0, then B (s 0. (H6 There exist a bounded nonempty open set Ω of R, M 2 > 0, θ > 0, and K L 1 (R such that 0 < θf (x, s f(x, ss, s M 2, x Ω, θf (x, s f(x, ss + K(x, s 0, x R. Definition 1.1. A function u W 1, (R is said to be a weak solution of the problem (1.1 if it satisfies A ( u ( u 2 u v dx + u 2 uv dx R R = B ( F (x, u dx f(x, uv dx + hvdx, v W 1, (R. R R R The main result of the present work is given by the following two theorems. Theorem 1.2. Assume that (H1 (H3 hold true. If α 0 < α 1 inf(α + 1, β + 1, then there exists η > 0 such that the problem (1.1 admits at least one nontrivial and nonnegative weak solution provided that h L (R < η. Theorem 1.3. Assume that (H1 (H6 hold true. In addition, we assume (H7 there exists R 0 > 0 such that γ(x = 0 for x R 0. If α 0 < α 1 inf(α + 1, β + 1, a 0 > 1 and λ 1 θ > λ 0, then there exists η > 0 such that the problem (1.1 admits at least two nontrivial and nonnegative weak solutions provided that h L (R < η.
4 4 S. AOUAOUI EJDE-2014/ Preliminaries Here, we state some interesting properties of the space W 1, (R that will be useful throughout this paper. Let Ω be a bounded domain of R, 2. First, we recall that the important Trudinger-Moser inequality (see [27, 35] asserts that exp ( α u 1 L 1 (Ω for u W 1, 0 (Ω and α > 0. Then, there exists a positive constant C > 0 depending only on such that ( sup exp α u 1 dx C Ω if α α, u W 1, 0 (Ω, u L (Ω 1 Ω where α = W and W 1 is the measure of the unit sphere in R. In the case of R, 2, we have the following result (for = 2, see [7, 33], and for 2, see [1, 30] [exp(α u 1 S 2 (α, u] dx < + for u W 1, (R and α > 0, R where S 2 (α, u = 2 k=0 α k k u 1. k! Moreover, if u L (R 1, u L (R M < + and α < α, then there exists a constant C = C(, M, α > 0, which depends only on, M and α such that [ exp(α u 1 S 2 (α, u ] dx C. R Furthermore, using above results together with Hölder s inequality, if α > 0 and q > 0, then u q[ exp(α u 1 S 2 (α, u ] dx < +, u W 1, (R. (2.1 R More precisely, if u W 1, (R M with αm 1 < α, then there exists C = C(α, M, q, > 0 such that u q[ exp(α u 1 S 2 (α, u ] dx C u q W 1, (R. (2.2 R 3. Proof of Theorem 1.2 First, observe that the appropriate space in which the problem (1.1 will be studied is Wr 1, (R which consists of all the functions in W 1, (R which are radial. The space Wr 1, (R will be equipped with the classical norm ( 1/ u = ( u + u dx. R It should be useful to remind that the continuous embedding W 1, (R L q (R holds for all q [, + [. We start by introducing the energy functional corresponding to the problem (1.1: J : Wr 1, (R R, J(u = A ( u ( B R F (x, u dx hu dx. R
5 EJDE-2014/107 EXISTECE OF MULTIPLE SOLUTIOS 5 By (H1 and (H2, it is clear that there exist c 1 > 0 and c 2 > 0 such that for all (x, s R R, we have F (x, s c 1 s α+1 + c 2 s β+1( exp(γ s 1 S 2 (γ, s, (3.1 where γ = sup x R γ(x. Taking (2.1 into account, it yields F (x, u L 1 (R, for all (x, u R W 1, r (R. Hence, the functional J is well defined on Wr 1, (R. Moreover, by standard arguments (see [6], we could easily establish that J is of class C 1 in Wr 1, (R and that we have J (u, v = A ( u ( u 2 u v dx + u 2 uv dx R R B ( F (x, u dx f(x, uv dx hv dx, u, v Wr 1, (R. R R R Here, according to Definition 1.1 and by the virtue of the known so-called principle of symmetric criticality (see [32], every critical point of the functional J is in fact a weak solution of the problem (1.1. Lemma 3.1. Assume that (H1 (H3 hold. Then, there exist µ > 0, ρ > 0 and η > 0 such that provided that h L (R < η. J(u µ, for all u W 1, r (R such that u = ρ, Proof. For 0 < M < 1 small enough, by (3.1 and (2.2, we have R F (x, u dx c 3 u inf(α+1,β+1, for u M. ow, consider 0 < ρ < M be such that c 3 ρ inf(α+1,β+1 < s 1. Then, we obtain B( F (x, u dx C 1 ( R F (x, u dx α1 C 1 (c 3 ρ inf(α+1,β+1 α1 R c 4 ρ α1 inf(α+1,β+1. (3.2 On the other hand, if we assume that ρ < s 0, for u = ρ, we have A( u = A(ρ C ρ α0 0. (3.3 α0 Using (3.2 and (3.3, we obtain J(u c 5 ρ α0 c 4 ρ α1 inf(α+1,β+1 h L (R ρ, for u = ρ. ow, since α 0 < α 1 inf(α + 1, β + 1, then we can choose ρ small enough such that η = c 5 ρ α0 1 c 4 ρ α1 inf(α+1,β+1 1 is positive. Hence, Lemma 3.1 holds with µ = ρ(η h L (R. Proof of Theorem 1.2 completed. Let ϕ C0 (R be a radial function such that ϕ 0, ϕ 0 and hϕ dx > 0. For 0 < t < 1, we have R ( t ϕ ( J(tϕ = A B F (x, tϕ dx t hϕ dx. R R
6 6 S. AOUAOUI EJDE-2014/107 Then d dt J(tϕ = t 1 ϕ A ( t ϕ B ( F (x, tϕ dx f(x, tϕϕ dx hϕ dx. R R R Obviously, we have lim f(x, tϕϕ dx = 0. t 0 + R Since 1 > 0, then one can easily find δ > 0 small enough such that d J(tϕ < 0 0 < t < δ. dt ρ Having in mind that J(0 = 0, then there exists 0 < t 0 < inf(δ, ϕ such that J(t 0 ϕ < 0. Set { } d ρ = inf J(u, u B(0, ρ, where B(0, ρ = {u Wr 1, (R, u ρ}. By Ekeland s variational principle (see [15], there exists a sequence (u n B(0, ρ such that J (u n 0 and J(u n d ρ as n +. Since (u n is bounded in Wr 1, (R, then there exists u Wr 1, (R such that u n u weakly in Wr 1, (R. We claim that, up to a subsequence, (u n is strongly convergent to u. We start by proving that sup( f(x, u n 1 dx < +. n R By (H3, there exists c 6 > 0 such that f(x, u n 1 dx R c 6 u n α 1 dx + c6 R ( γ S 2 1, u n Since α 1 >, we have dx. R u n β 1 ( ( γ exp ( sup u n α 1 dx < +. n R 1 u n 1 (3.4 On the other hand, notice that we can assume ρ defined in Lemma 3.1 is such that γ 1 ρ 1 < α. Consequently, by (2.2, it follows that there exists a positive constant c 7 such that ( ( u n β γ ( 1 exp R 1 u γ 1 n S 2 1, u n dx c 7, n. By (3.4, we immediately deduce that sup( f(x, u n 1 dx < +. n R Let R > 0 and consider B R = {x R, x < R}. By Hölder s inequality, we have ( 1 ( 1/. f(x, u n (u n u dx f(x, u n 1 dx u n u dx B R R BR
7 EJDE-2014/107 EXISTECE OF MULTIPLE SOLUTIOS 7 Taking into account that the embedding W 1, (R into L (B R is compact, it follows lim f(x, u n (u n u dx = 0. (3.5 n + B R By the radial lemma (see [6], there exists a positive constant C > 0 depending only on such that We have x R + = c 8 c 9 j= 1 u n (x C x u n L (R, x 0. ( ( u n β γ 1 exp + j= 1 + j= 1 c 10. R β u n ( γ 1 j u n (β+j 1 dx j! x R ( γ 1 j + j! R ( γ 1 j + j! R r 1 r (β+j 1 dr r β 1 +1 dr ( γ S 2 1, u n dx (3.6 Let ɛ > 0. By (3.6, there exists R 1 (ɛ > 1 large enough such that, for all n, ( ( u n β γ ( 1 exp 1 u γ 1 n S 2 1, u n dx ɛ. (3.7 x R 1(ɛ ext, we have x R u n α 1 dx c11 + R r α dr R. α c 12 Since α 1 >, then one can find R 2(ɛ > 1 large enough such that u n α 1 dx ɛ, n. (3.8 x R 2(ɛ Put R(ɛ = sup(r 1 (ɛ, R 2 (ɛ. By (3.7 and (3.8, it yields f(x, u n 1 dx 2ɛ, n. (3.9 x R(ɛ By Hölder s inequality and (3.9, we obtain f(x, u n (u n u dx x R(ɛ ( x R(ɛ c 13 ɛ 1, n. 1 f(x, u n 1 dx u n u L (R (3.10
8 8 S. AOUAOUI EJDE-2014/107 ow, (3.10 together with (3.5 imply lim n + R f(x, u n (u n u dx = 0. (3.11 ext, arguing as in the establishment of the boundedness of the sequence ( f(x, u n 1 dx, R we can show that ( sup F (x, u n dx < +. n R That fact together with (3.11 leads to B ( F (x, u n dx f(x, u n (u n u dx 0 R R as n +. Using the weak convergence of (u n to u in Wr 1, (R, it immediately follows h(u n u dx 0 as n +. R Taking these results into account and having in mind that J (u n (u n u 0, we deduce that A ( u n ( u n 2 u n (u n u dx + u n 2 u n (u n u dx 0, R R as n +. If u n 0, then u n 0 strongly in Wr 1, (R and there is nothing to prove. Otherwise, u n t > 0 and A ( un A ( t > 0. In that case, we obtain ( lim u n 2 u n (u n u dx + u n 2 u n (u n u dx = 0, n + R R which implies that (u n is strongly convergent to u in Wr 1, (R. Finally, we conclude that J(u = d ρ J(t 0 ϕ < 0 and that J (u = 0. Hence, u is a nontrivial weak solution of (1.1 with negative energy. Set u = min(u, 0. We have J (u, u = 0. Thus, A ( u u B ( F (x, u dx R f(x, uu dx = R hu dx 0. R Having in mind that f(x, uu = 0, we deduce that u = 0 and therefore u Proof of Theorem 1.3 A first solution with negative energy is given by Theorem 1.2. The existence of a second weak solution will be proved using the well known Mountain Pass Theorem. We start by the following lemma. Lemma 4.1. Assume that the hypotheses of Theorem 1.3 hold. Then, the functional J satisfies the Palais-Smale condition.
9 EJDE-2014/107 EXISTECE OF MULTIPLE SOLUTIOS 9 Proof. Let (u n W 1, (R be such that (J(u n is bounded and J (u n 0. We claim that, up to a subsequence, (u n is strongly convergent. By (H4, we have ( u λ 0 A A ( u u n c 14, n. (4.1 On the other hand, by (H6, we have 0 θ F (x, u n dx R f(x, u n u n dx + c 15. R Let 0 < ɛ < inf(θ, c15 M 1. If then we obtain R F (x, u n dx c 15 ɛ, 0 (θ ɛ F (x, u n dx R f(x, u n u n dx. R This inequality together with (H5 imply B ( ( F (x, u n dx f(x, u n u n dx λ 1 (θ ɛb F (x, u n dx R R R B ( F (x, u n dx f(x, u n u n dx R R (θ ɛb ( F (x, u n dx F (x, u n dx 0. R R If F (x, u R n dx c 15 /ɛ, it is clear that there exists a positive constant c ɛ > 0 such that B ( ( F (x, u n dx f(x, u n u n dx λ 1 (θ ɛb F (x, u n dx c ɛ. R R R Hence, we deduce that B ( F (x, u n dx f(x, u n u n dx λ 1 (θ ɛb( F (x, u n dx R R R (4.2 c ɛ, n. ow, choose 0 < ɛ < inf(θ, c 15 /M 1 small enough such that λ 1 (θ ɛ > λ 0. Since (u n is a (PS sequence of J, then there exists a positive constant c 16 > 0 such that Thus, ( ( un λ 1 (θ ɛa λ 1 (θ ɛj(u n J (u n, u n c 16 (1 + u n, n. A ( u n u n + B ( ( f(x, u n dx f(x, u n u n dx λ 1 (θ ɛb F (x, u n dx R R R c 17 (1 + u n, n. By (4.2, we have ( un λ 1 (θ ɛa A ( u n u n c ɛ + c 17 (1 + u n, n.
10 10 S. AOUAOUI EJDE-2014/107 By (4.1, we have ( un (λ 1 (θ ɛ λ 0 A c ɛ + c 14 + c 17 (1 + u n, n. Finally, using again (H4, we obtain c 18 u n a0 c 19 (1 + u n, n. Taking into account that a 0 > 1, we conclude that (u n is bounded in Wr 1, (R. Denote by u the weak limit of (u n in Wr 1, (R. Here, in order to prove that (u n is strongly convergent to u in Wr 1, (R, we can follow the arguments used to establish the same result in the proof of Theorem 1.2 with some suitable modification. In fact, the arguments used in the proof of Theorem 1.2 to establish that ( sup f(x, u n 1 dx < + n R are no longer valid. It is clear, that always we have ( sup u n α 1 dx < +. n R On the other hand, by (H7 we have ( ( u n β 1 γ(x ( exp R 1 u 1 γ(x n S 2 1, u n dx ( ( = u n β 1 γ(x ( exp x R 0 1 u 1 γ(x n S 2 1, u n dx ( ( u n β γ ( 1 exp x R 0 1 u γ 1 n S 2 1, u n dx. Using (3.6, we obtain sup( n R u n β 1 ( exp ( γ(x 1 u n 1 Consequently, ( sup f(x, u n 1 dx < +. n R This completes the proof of Lemma 4.1. ( γ(x S 2 1, u n dx < +. Proof of Theorem 1.3 completed. Let w C 0 (R be a radial function such that w 0 and inf x Ω w(x > 0. By (H 6, there exists t 1 > 0 large enough and a positive constant c 20 such that F (x, tw(x c 20 t θ, t t 1, x Ω. Thus, F (x, tw dx F (x, tw dx c 21 t θ, t t 1. (4.3 R Ω On the other hand, by (H4 and (H5, one can easily find t 2 > 0 large enough such that B(t c 22 t λ1, t t 2, (4.4 A(t c 23 t λ0, t t 2.
11 EJDE-2014/107 EXISTECE OF MULTIPLE SOLUTIOS 11 Combining (4.3 and (4.4, for t large enough it follows ( t w ( J(tw = A B F (x, tw dx t hw dx c 24 t λ0 c 25 t λ1θ. R R Since λ 1 θ > λ 0, we deduce that J(tw as t +. Finally, taking Lemma 3.1 and Lemma 4.1 into account and according to the Mountain Pass Theorem, the functional J has a critical point with positive energy. Therefore, we conclude that the problem (1.1 admits at least two nontrivial weak solutions. This completes the proof of Theorem 1.3. References [1] S. Adachi, K. Tanaka; Trudinger type inequalities in R and their best constants, Proc. Amer. Math. Soc. 128 ( [2] Adimurthi; Existence of positive solutions of the semilinear Dirichlet problem with critical growth for the -Laplacian. Ann. Sc. orm. Super. Pisa, Cl. Sci. 17(3 ( [3] C. O. Alves, M. A. S. Souto; Multiplicity of positive solutions for a class of problems with exponential critical growth in R 2, J. Differential Equations, 244 ( [4] C. O. Alves, F. J. S. A. Corrêa, T. F. Ma; Positive solutions for a quasilinear elliptic equation of Kirchhoff type, Comput. Math. Appl. 49 ( [5] F. V. Atkinson, L. A. Peletier; Elliptic equations with critical growth. Math. Inst. Univ. Leiden, Rep. 21 (1986. [6] H. Beresticky, P. L. Lions; onlinear scalar field equations, I. Existence of ground state, Arch. Ration. Mech. Anal. 82 ( [7] D. Cao; ontrivial solution of semilinear elliptic equation with critical exponent in R 2, Commun. Partial Differ. Equ. 17(34 ( [8] S. Y. A. Chang, P. Yang; The inequality of Moser and Trudinger and applications to conformal geometry, Commun. Pure Appl. Math. 56(8 ( [9] C. Chen, H. Song, Z. Xiu; Multiple solutions for p-kirchhoff equations in R, onlinear Anal. 86 ( [10] S. Chen, L. Li; Multiple solutions for the nonhomogeneous Kirchhoff equation on R, onlinear Anal. Real Worl Appl. 14 ( [11] M. Chipot, B. Lovat; Some remarks on nonlocal elliptic and parabolic problems, onlinear Anal. 30 ( [12] F. Colasuonno, P. Pucci; Multiplicity of solutions for p(x polyharmonic elliptic Kirchhoff equations, onlinear Anal. 74 ( [13] F. J. S. A. Corrêa, G. M. Figueiredo; On an elliptic equation of p-kirchhoff type via variational methods, Bull. Aust. Math. Soc. 74 ( [14] F. J. S. A. Corrêa, S. D. B. Menezes; Existence of solutions to nonlocal and singuler elliptic problems via Galerkin method, Electronic J. Differential Equations 15 ( [15] I. Ekeland; On the variational principle, J. Math. Anal. App. 47 ( [16] X. Fan; On nonlocal p(x Laplacian Dirichlet problems, onlinear Anal. 72 ( [17] D. G. de Figueiredo, J. M. do Ó, B. Ruf; On an inequality by. Trudinger and J. Moser and related elliptic equations. Commun. Pure Appl. Math. 55(2 ( [18] D. G. de Figueiredo, O.H. Miyagaki, B. Ruf; Elliptic equations in R 2 with nonlinearities in the critical growth range, Calc. Var. Partial Differ. Equ. 3(2 ( [19] G. M. Figueiredo, U. B. Severo; Ground state solution for a Kirchhoff problem with exponential critical growth, arxiv: v1 (2013. [20] G. Kirchhoff; Mechanik, Teubner: Leibzig, [21]. Lam, G. Lu; Existence and multiplicity of solutions to equations of -Laplacian type with critical exponential growth in R, J. Funct. Anal. 262 ( [22]. Lam, G. Lu; -Laplacian equations in R with subcritical and critical growth without the Ambrosetti-Rabinowitz condition, Adv. onlinear Stud. Vol. 13, umber 2 ( [23]. Lam, G. Lu; Existence of nontrivial solutions to polyharmonic equations with subcritical and critical exponential growth. Discrete Contin. Dyn. Syst. 32(6 (
12 12 S. AOUAOUI EJDE-2014/107 [24]. Lam, G. Lu; The Moser-Trudinger and Adams inequalities and elliptic and subelliptic equations with nonlinearity of exponential growth. In: Recent Developments in Geometry and Analysis, Advanced Lectures in Mathematics, vol. 23 ( [25]. Lam, G. Lu; Elliptic equations and systems with subcritical and critical exponential growth without the Ambrosetti-Rabinowitz condition, J. Geom. Anal., DOI /s [26] J. L. Lions; On some question in boundary value problems of mathematical physics, orth- Holland Math. Stud. Vol. 30, orth-holland, Amsterdam, ew York, 1978, [27] J. Moser; A sharp form of an inequality by. Trudinger, Indiana Univ. Math. J. 20 (1970/ [28] J. M. do Ó; Semilinear Dirichlet problems for the -Laplacian in R with nonlinearities in the critical growth range, Differ. Integral Equ. 9(5 ( [29] J. M. do Ó, E. Medeiros, U. Severo; On a quasilinear nonhomogeneous elliptic equation with critical growth in R, J. Differ. Equ. 246(4 ( [30] J. M. do Ó; -Laplacian equations in R with critical growth, Abstr. Appl. Anal. Vol. 2, Issue 3-4, ( [31] J. M. do Ó, E. Medeiros, U. Severo; A nonhomogeneous elliptic problem involving critical growth in dimension two, J. Math. Anal. Appl. vol.345, no. 1 ( [32] R. S. Palais; The principle of symmetric criticality, Comm. Math. Phys. 69 ( [33] B. Ruf; A sharp Trudinger-Moser type inequality for unbounded domains in R 2, J. Funct. Anal. 219(2 ( [34] E. Tonkes; Solutions to a perturbed critical semilinear equation concerning the -Laplacian in R, Comment. Math. Univ. Carolin. 40 ( [35]. S. Trudinger; On imbeddings into Orlicz spaces and some applications, J. Math. Mech. 17 ( [36] Y. Wang, J. Yang, Y. Zhang; Quasilinear elliptic equations involving the -Laplacian with critical exponential growth in R, onlinear Anal. 71 ( [37] F. Wang, Y. An; Existence of nontrivial solution for a nonlocal elliptic equation with nonlinear boundary condition, Bound. Value Probl. 2009, Article ID Sami Aouaoui Institut Supérieur des Mathématiques Appliquées et de l Informatique de Kairouan, Avenue Assad Iben Fourat, 3100 Kairouan, Tunisie address: aouaouisami@yahoo.fr, Phone , Fax
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