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In this paper, we study a class of generalized extensible beam equations with a superlinear nonlinearity begin{equation*} left{ begin{array}{ll} Delta ^{2}u-Mleft( Vert abla uVert _{L^{2}}^{2}right) Delta u+lambda V(x) u=f( x,u) & text{ in }mathbb{R}^{N}, uin H^{2}(mathbb{R}^{N}), & end{array}% right. end{equation*}% where $Ngeq 3$, $M(t) =at^{delta }+b$ with $a,delta >0$ and $bin mathbb{% R}$, $lambda >0$ is a parameter, $Vin C(mathbb{R}^{N},mathbb{R})$ and $% fin C(mathbb{R}^{N}times mathbb{R},mathbb{R}).$ Unlike most other papers on this problem, we allow the constant $b$ to be nonpositive, which has the physical significance. Under some suitable assumptions on $V(x)$ and $f(x,u)$, when $a$ is small and $lambda$ is large enough, we prove the existence of two nontrivial solutions $u_{a,lambda }^{(1)}$ and $% u_{a,lambda }^{(2)}$, one of which will blow up as the nonlocal term vanishes. Moreover, $u_{a,lambda }^{(1)}rightarrow u_{infty}^{(1)}$ and $% u_{a,lambda }^{(2)}rightarrow u_{infty}^{(2)}$ strongly in $H^{2}(mathbb{% R}^{N})$ as $lambdarightarrowinfty$, where $u_{infty}^{(1)} eq u_{infty}^{(2)}in H_{0}^{2}(Omega )$ are two nontrivial solutions of Dirichlet BVPs on the bounded domain $Omega$. It is worth noting that the regularity of weak solutions $u_{infty}^{(i)}(i=1,2)$ here is explored. Finally, the nonexistence of nontrivial solutions is also obtained for $a$ large enough.
This article concerns the fractional elliptic equations begin{equation*}(-Delta)^{s}u+lambda V(x)u=f(u), quad uin H^{s}(mathbb{R}^N), end{equation*}where $(-Delta)^{s}$ ($sin (0,,,1)$) denotes the fractional Laplacian, $lambda >0$ is a parameter, $
In this paper we deal with the multiplicity of positive solutions to the fractional Laplacian equation begin{equation*} (-Delta)^{frac{alpha}{2}} u=lambda f(x)|u|^{q-2}u+|u|^{2^{*}_{alpha}-2}u, quadtext{in},,Omega, u=0,text{on},,partialOmega, end
Using increasing sequences of real numbers, we generalize the idea of formal moment differentiation first introduced by W. Balser and M. Yoshino. Slight departure from the concept of Gevrey sequences enables us to include a wide variety of operators
In this paper we study uniqueness properties of solutions of the k-generalized Korteweg-de Vries equation. Our goal is to obtain sufficient conditions on the behavior of the difference $u_1-u_2$ of two solutions $u_1, u_2$ of the equation at two di
Generalized summability results are obtained regarding formal solutions of certain families of linear moment integro-differential equations with time variable coefficients. The main result leans on the knowledge of the behavior of the moment derivati