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Multiplicity of Solutions of Weighted (p,q)-Laplacian with Small...
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Multiplicity of Solutions of Weighted (p,q)-Laplacian with Small Sources and High-Order Perturbations,Huijuan Song,Jingxue Yin,In this paper we study the existence of infinitely many solutions to the degenerate quasilinear elliptic sy stem -div(h1(x)|▽u|p-2▽u)=d(x)|u|r-2u+Gu(x,u,v) inΩ, -div(h2(x)|�
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˖ڍመڙጲ
http://www.paper.edu.cn
Multiplicity of Solutions of Weighted
(p, q)-Laplacian with
Small Sources
Huijuan Song
1∗
, Jingxue Yin
2
, Zejia Wang
3
1
Department of Mathematics, Jilin University, Changchun 130012
2
School of Mathematical Sciences, South China Normal University, Guangzhou 510631
3
College of Mathematics and Informational Science,
Jiangxi Normal University, Nanchang 330022
Abstract: In this paper we study the existence of infinitely many solutions to the degenerate
quasilinear elliptic system
−div(h
1
(x)|∇u|
p−2
∇u) = d(x)|u|
r−2
u + G
u
(x, u, v) in Ω,
−div(h
2
(x)|∇v|
q−2
∇v) = f (x)|v|
s−2
v + G
v
(x, u, v) in Ω,
u = v = 0 on ∂Ω,
where Ω is a bounded domain in R
N
with smooth boundary ∂Ω, N ≥ 2, 1 < r < p < N, 1 < s < q < N,
h
1
(x), h
2
(x) are allowed to have “essential” zeroes at some points in Ω, d(x)|u|
r−2
u and f (x)|v|
s−2
v are
small sources with G
u
(x, u, v), G
v
(x, u, v) being their high-order perturbations with respect to (u, v) near
the origin respectively.
Key words: Weighted (p, q)-Laplacian; Small sources; Multiplicity
1 Introduction
The purpose of this paper is to study the multiplicity of solutions for the system with small sources:
−div(h
1
(x)|∇u|
p−2
∇u) = d(x)|u|
r−2
u + G
u
(x, u, v) in Ω,
−div(h
2
(x)|∇v|
q−2
∇v) = f (x)|v|
s−2
v + G
v
(x, u, v) in Ω,
u = v = 0 on ∂Ω,
(1)
Huijuan Song (1985-), female, Ph. D. student, major research direction: nonlinear diffusion equations. Jingxue Yin (1956-), male, professor,
major research direction: nonlinear diffusion equations. Correspondence author: Zejia Wang (1979-), female, associate professor, major research
direction: nonlinear diffusion equations.
∗
Supported by the Graduate Innovation Fund of Jilin University (No. 20121031).
- 1 -
˖ڍመڙጲ
http://www.paper.edu.cn
where Ω ⊂ R
N
is a bounded domain with smooth boundary ∂Ω, N ≥ 2, 1 < r < p < N, 1 < s < q < N,
h
1
(x), h
2
(x) are allowed to have “essential” zeroes at some points in Ω, d(x) and f (x) can be very small,
in particular, small supports and sign changing for d(x) and f (x) are permitted, the terms G
u
(x, u, v) and
G
v
(x, u, v) will be considered as high-order perturbations of the small sources d(x)|u|
r−2
u and f (x)|v|
s−2
v
with respect to (u, v) near the origin respectively.
The present paper is a continuation of our previous paper [1], in which we investigated the follow-
ing quasilinear elliptic system
−div(h
1
(x)|∇u|
p−2
∇u) = ζa(x)|u|
r−2
u + λµ(x)F
u
(x, u, v) in Ω,
−div(h
2
(x)|∇v|
q−2
∇v) = σb(x)|v|
s−2
v + λµ(x)F
v
(x, u, v) in Ω,
u = v = 0 on ∂Ω,
(2)
where F(x, u, v) satisfies certain global structure conditions which can be divided into the (p, q)-sublinear
case, the (p, q)-linear case and the (p, q)-suplinear case with different features of multiplicity of solu-
tions according to the parameters ζ, σ, λ. The relationship between these two papers will be described
in Section 2.
For the case of single equation, it was Wang [2] who first considered a similar problem with small
sources
−div(|∇u|
p−2
∇u) = d(x)|u|
r−2
u + g(x, u) in Ω,
u = 0 on ∂Ω,
(3)
where 1 < r < p < ∞, d(x) ≡ λ with λ being a positive constant, g(x, u) ∈ C(Ω × (−δ, δ), R) for some
δ > 0, is odd in u and g(x, u) = o(|u|
r−1
) as u → 0 uniformly for x ∈ Ω. By using a variational principle
by Clark [3], Wang proved that the problem (3) has a sequence of solutions with negative energy such
that the sequence of solutions converges to 0 in the L
∞
norm. That is to say, the existence of such a
sequence of solutions relies only on local behaviors of the equations, and assumptions on g only for
small u are required. Later, this result was generalized by Guo [4] to the problem (3) where the weight
function d(x) satisfies Ω
+
d
= {x ∈ Ω; d(x) > 0} , ∅ and g(x, u) = o(|u|
p−1
), as |u| → 0 uniformly for
x ∈ Ω. It is worthy of pointing out that the assumption on d in [2] has been relaxed in [4], but the
assumption on g with respect to u near the origin in [4] is stronger than that in [2]. It should be noticed
that positivity b(x) ≡ λ was used in an essential way in [2]. Recently, Chung [5] further extended the
result to the system (1) with linear principal parts, that is
p = q = 2,
where the diffusion coefficients h
1
, h
2
are from the space (H )
σ
with σ ∈ [0, +∞), consisting of all
functions h : Ω → [0, +∞) such that h ∈ L
1
loc
(Ω) and lim inf
x→z
|x − z|
−σ
h(x) > 0 holds for all z ∈ Ω,
r = s, Ω
+
d
∩ Ω
+
f
, ∅ and G(x, u, v) ∈ C
1
(Ω × (−ρ
1
, ρ
1
) × (−ρ
2
, ρ
2
), R) for small positive constants ρ
1
, ρ
2
,
is even in (u, v) and
lim
|u|→0
G
u
(x, u, v)
|u|
θ
|v|
τ+1
= 0, lim
|v|→0
G
v
(x, u, v)
|u|
θ+1
|v|
τ
= 0
- 2 -
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