Topological Methods in Nonlinear Analysis https://apcz.umk.pl/TMNA <p><span style="font-size: 12px;">TMNA publishes research and survey papers on a wide range of nonlinear analysis, giving preference to those which employ topological methods. Papers in topology which are of intereset in nonlinear problems may also be included.</span></p><span style="font-size: 12px;">The current impact factors are <strong>IF 2020 = <strong id="yui_patched_v3_11_0_1_1578693261971_720">0.860</strong></strong><strong style="font-size: 12px;">.</strong></span><p> </p><p><span style="font-size: 12px;">The project "Digital service and digitization of the resources of the journal Topological Methods in Nonlinear Analysis” including the digital service for the volumes 53 (2019) and 54 (2019) has been funded by the Ministry of Science and Higher Education as a part of the 623/P-DUN/2018 agreement. </span></p><p><span><img src="/czasopisma/public/site/images/tmna/mnisw.jpg" alt="MNiSW" width="300/" /></span></p> Nicolaus Copernicus University in Toruń en-US Topological Methods in Nonlinear Analysis 1230-3429 Transversality conditions for the existence of solutions of first-order discontinuous functional differential equations https://apcz.umk.pl/TMNA/article/view/35216 We are concerned with the existence of extremal solutions to a large class of first-order functional differential problems under weak regularity assumptions. Our technique involves multivalued analysis and the method of lower and upper solutions in order to obtain a new existence result to a scalar Cauchy problem. As a consequence of this result and a monotone iterative method for discontinuous operators, we derive our main existence result which is illustrated by several examples concerning well-known models: a generalized logistic equation or second-order problems in the presence of dry friction. Rodrigo López Pouso Ignacio Márquez Albés Jorge Rodríguez-López Copyright (c) 2021 Topological Methods in Nonlinear Analysis https://creativecommons.org/licenses/by-nd/4.0 2021-09-12 2021-09-12 1 17 10.12775/TMNA.2021.001 Trajectory approximately controllability and optimal control for noninstantaneous impulsive inclusions without compactness https://apcz.umk.pl/TMNA/article/view/35212 In this paper, a noninstantaneous impulsive differential inclusion model is established based on the heating phenomenon of the rod. The controllability problem for this system governed by a semilinear differential inclusion with noninstantaneous impulses is studied in a Banach space and in this differential inclusion system we assume that the semigroup generated by the linear part of the inclusion is not compact. We suppose that the set-valued nonlinearity satisfies a regularity condition expressed in terms of the Hausdorff measure of noncompactness and some sufficient conditions for approximately controllability for both upper and almost lower semicontinuous types of nonlinearity are presented. Also we discuss existence and the stability of optimal control. As an application, the controllability for a differential inclusion system governed by a heat equation is considered. Shengda Liu JinRong Wang Donal O'Regan Copyright (c) 2021 Topological Methods in Nonlinear Analysis https://creativecommons.org/licenses/by-nd/4.0 2021-10-11 2021-10-11 19 49 10.12775/TMNA.2020.069 Componentwise localization of critical points for functionals defined on product spaces https://apcz.umk.pl/TMNA/article/view/35218 A new notion of linking is introduced to treat minima as minimax points in a unitary way. Critical points are located in conical annuli making possible to obtain multiplicity. For functionals defined on a Cartesian product, the localization of critical points is given on components and the variational properties of the components can differ, part of them being of minimum type, others of mountain pass type. Radu Precup Copyright (c) 2021 Topological Methods in Nonlinear Analysis https://creativecommons.org/licenses/by-nd/4.0 2021-09-12 2021-09-12 51 77 10.12775/TMNA.2021.007 Periodic solutions of superlinear and sublinear state-dependent discontinuous differential equations https://apcz.umk.pl/TMNA/article/view/35220 A classical, second-order differential equation is considered with state-dependent impulses at both the position and its derivative. This means that the instants of impulsive effects depend on the solutions and they are not fixed beforehand, making the study of this problem more difficult and interesting from the real applications point of view. The existence of periodic solutions follows from a transformation of the problem into a planar system followed by a study of the Poincaré map and the use of some fixed point theorems in the plane. Some examples are presented to illustrate the main results. Juan J. Nieto José M. Uzal Copyright (c) 2021 Topological Methods in Nonlinear Analysis https://creativecommons.org/licenses/by-nd/4.0 2021-09-12 2021-09-12 79 96 10.12775/TMNA.2021.016 Extending and paralleling Stechkin's category theorem https://apcz.umk.pl/TMNA/article/view/35207 We strengthen one of Stechkin's theorems. We also obtain results in the same spirit regarding the farthest point mapping. We work in length spaces, sometimes without bifurcating geodesics, sometimes with geodesic extendability. Tudor Zamfirescu Copyright (c) 2021 Topological Methods in Nonlinear Analysis https://creativecommons.org/licenses/by-nd/4.0 2021-09-12 2021-09-12 97 103 10.12775/TMNA.2020.063 The Nehari manifold for indefinite Kirchhoff problem with Caffarelli-Kohn-Nirenberg type critical growth https://apcz.umk.pl/TMNA/article/view/35208 In this paper we study the following class of nonlocal problem involving Caffarelli-Kohn-Nirenberg type critical growth $$ L(u)-\lambda h(x)|x|^{-2(1+a)}u=\mu f(x)|u|^{q-2}u+|x|^{-pb}|u|^{p-2}u\quad \text{in } \mathbb R^N, $$% where $h(x)\geq 0$, $f(x)$ is a continuous function which may change sign, $\lambda, \mu$ are positive real parameters and $1&lt; q&lt; 2&lt; 4&lt; p=2N/[N+2(b-a)-2]$, $0\leq a&lt; b&lt; a+1&lt; N/2$, $N\geq 3$. Here $$ L(u)=-M\left(\int_{\mathbb R^N} |x|^{-2a}|\nabla u|^2dx\right)\mathrm {div} \big(|x|^{-2a}\nabla u\big) $$ and the function $M\colon \mathbb R^+_0\to\mathbb R^+_0$ is exactly the Kirchhoff model, given by $M(t)=\alpha+\beta t$, $\alpha, \beta&gt; 0$. The above problem has a double lack of compactness, firstly because of the non-compactness of Caffarelli-Kohn-Nirenberg embedding and secondly due to the non-compactness of the inclusion map $$u\mapsto \int_{\mathbb R^N}h(x)|x|^{-2(a+1)}|u|^2dx,$$ as the domain of the problem in consideration is unbounded. Deriving these crucial compactness results combined with constrained minimization argument based on Nehari manifold technique, we prove the existence of at least two positive solutions for suitable choices of parameters $\lambda$ and $\mu$. David G. Costa João Marcos do Ó Pawan K. Mishra Copyright (c) 2021 Topological Methods in Nonlinear Analysis https://creativecommons.org/licenses/by-nd/4.0 2021-09-12 2021-09-12 105 134 10.12775/TMNA.2020.064 Nonlinear Volterra delay evolution inclusions subjected to nonlocal initial conditions https://apcz.umk.pl/TMNA/article/view/35209 This paper deals with a nonlinear Volterra delay evolution inclusion subjected to a nonlocal implicit initial condition. The evolution inclusion involves an $m$-dissipative operator (possibly multivalued and/or nonlinear) and a noncompact interval. We first consider the evolution inclusion subjected to a local initial condition and prove an existence result for bounded $C^0$-solutions. Then, using a fixed point theorem for upper semicontinuous multifunctions with contractible values, we obtain a global solvability result for the original problem. Finally, we present an example to illustrate the abstract result. Yang-Yang Yu Rong-Nian Wang Ioan I. Vrabie Copyright (c) 2021 Topological Methods in Nonlinear Analysis https://creativecommons.org/licenses/by-nd/4.0 2021-09-12 2021-09-12 135 160 10.12775/TMNA.2020.065 A three solutions theorem for Pucci's extremal operator and its application https://apcz.umk.pl/TMNA/article/view/35210 In this article we prove a three solution type theorem for the following boundary value problem: \begin{equation*} \label{abs} \begin{cases} -\mathcal{M}_{\lambda,\Lambda}^+(D^2u) =f(u)&amp; \text{in }\Omega,\\ u =0&amp; \text{on }\partial\Omega, \end{cases} \end{equation*} where $\Omega$ is a bounded smooth domain in $\mathbb{R}^N$ and $f\colon [0,\infty]\to[0,\infty]$ is a $C^{\alpha}$ function. This is motivated by the work of Amann \cite{aman} and Shivaji \cite{shivaji1987remark}, where a three solutions theorem has been established for the Laplace operator. Furthermore, using this result we show the existence of three positive solutions to above boundary value by explicitly constructing two ordered pairs of sub and supersolutions when $f$ has a sublinear growth and $f(0)=0.$ Mohan Mallick Ram Baran Verma Copyright (c) 2021 Topological Methods in Nonlinear Analysis https://creativecommons.org/licenses/by-nd/4.0 2021-09-12 2021-09-12 161 179 10.12775/TMNA.2020.066 A singular perturbed problem with critical Sobolev exponent https://apcz.umk.pl/TMNA/article/view/35211 This paper deals with the following nonlinear elliptic problem \begin{equation}\label{eq0.1} -\varepsilon^2\Delta u+\omega V(x)u=u^{p}+u^{2^{*}-1},\quad u&gt; 0\quad\text{in}\ \R^N, \end{equation} where $\omega\in\R^{+}$, $N\geq 3$, $p\in (1,2^{*}-1)$ with $2^{*}={2N}/({N-2})$, $\varepsilon&gt; 0$ is a small parameter and $V(x)$ is a given function. Under suitable assumptions, we prove that problem (\ref{eq0.1}) has multi-peak solutions by the Lyapunov-Schmidt reduction method for sufficiently small $\varepsilon$, which concentrate at local minimum points of potential function $V(x)$. Moreover, we show the local uniqueness of positive multi-peak solutions by using the local Pohozaev identity. Mengyao Chen Qi Li Copyright (c) 2021 Topological Methods in Nonlinear Analysis https://creativecommons.org/licenses/by-nd/4.0 2021-09-12 2021-09-12 181 207 10.12775/TMNA.2020.067 A classical approach for the $p$-Laplacian in oscillating thin domains https://apcz.umk.pl/TMNA/article/view/35457 In this work we study the asymptotic behavior of solutions to the $p$-Laplacian equation posed in a 2-dimensional open set which degenerates into a line segment when a positive parameter $\varepsilon$ goes to zero (a thin domain perturbation). Also, we notice that oscillatory behavior on the upper boundary of the region is allowed. Combining methods from classic homogenization theory and monotone operators we obtain the homogenized equation proving convergence of the solutions and establishing a corrector function which guarantees strong convergence in $W^{1,p}$ for $1< p< +\infty$. Jean Carlos Nakasato Marcone Corrêa Pereira Copyright (c) 2021 Jean Carlos Nakasato, Marcone Corrêa Pereira https://creativecommons.org/licenses/by-nd/4.0 2021-09-23 2021-09-23 209 231 10.12775/TMNA.2021.009 Critical Kirchhoff-Choquard system involving the fractional $p$-Laplacian operator and singular nonlinearities https://apcz.umk.pl/TMNA/article/view/35213 In this paper we study a class of critical fractional $p$-Laplacian Kirchhoff-Choquard systems with singular nonlinearities and two parameters $\lambda$ and $\mu$. By discussing the Nehari manifold structure and fibering maps analysis, we establish the existence of two positive solutions for above systems when $\lambda$ and $\mu$ satisfy suitable conditions. Yanbin Sang Copyright (c) 2021 Topological Methods in Nonlinear Analysis https://creativecommons.org/licenses/by-nd/4.0 2021-09-12 2021-09-12 233 274 10.12775/TMNA.2020.070 Anti-periodic problem for semilinear differential inclusions involving Hille-Yosida operators https://apcz.umk.pl/TMNA/article/view/35219 In this paper we are interested in the anti-periodic problem governed by a class of semilinear differential inclusions with linear parts generating integrated semigroups. By adopting the Lyapunov-Perron method and the fixed point argument for multivalued maps, we prove the existence of anti-periodic solutions. Furthermore, we study the long-time behavior of mild solutions in connection with anti-periodic solutions. Consequently, as the nonlinearity is of single-valued, we obtain the exponential stability of anti-periodic solutions. An application of theoretical results to a class of partial differential equations will be given. Nguyen Thi Van Anh Tran Dinh Ke Do Lan Copyright (c) 2021 Topological Methods in Nonlinear Analysis https://creativecommons.org/licenses/by-nd/4.0 2021-09-12 2021-09-12 275 305 10.12775/TMNA.2021.010 Topological stability and shadowing of dynamical systems from measure theoretical viewpoint https://apcz.umk.pl/TMNA/article/view/35214 In this paper it is proved that a topologically stable invariant measure has no sinks or sources in its support; an expansive homeomorphism is topologically stable if it exhibits a topologically stable nonatomic Borel support measure and a continuous map has the shadowing property if there exists an invariant measure with the shadowing property such that each almost periodic point is contained in the support of the invariant measure. Jiandong Yin Meihua Dong Copyright (c) 2021 Topological Methods in Nonlinear Analysis https://creativecommons.org/licenses/by-nd/4.0 2021-09-12 2021-09-12 307 321 10.12775/TMNA.2020.071 Linearization of topologically Anosov homeomorphisms of non compact surfaces of genus zero and finite type https://apcz.umk.pl/TMNA/article/view/35217 We study the dynamics of {\it topologically Anosov} homeomorphisms of non-compact surfaces. In the case of surfaces of genus zero and finite type, we classify them. We prove that if $f\colon S \to S$, is a Topologically Anosov homeomorphism where $S$ is a non-compact surface of genus zero and finite type, then $S= \mathbb{R}^2$ and $f$ is conjugate to a homothety or reverse homothety (depending on wether $f$ preserves or reverses orientation). A weaker version of this result was conjectured in \cite{cgx}. Gonzalo Cousillas Jorge Groisman Juliana Xavier Copyright (c) 2021 Topological Methods in Nonlinear Analysis https://creativecommons.org/licenses/by-nd/4.0 2021-09-12 2021-09-12 323 333 10.12775/TMNA.2021.002 Nonlinear perturbations of a periodic fractional Laplacian with supercritical growth https://apcz.umk.pl/TMNA/article/view/35215 Our main goal is to explore the existence of positive solutions for a class of nonlinear fractional Schrödinger equation involving supercritical growth given by $$ (- \Delta)^{\alpha} u + V(x)u=p(u),\quad x\in \mathbb{R^N},\ N \geq 1. $$ We analyze two types of problems, with $V$ being periodic and asymptotically periodic; for this we use a variational method, a truncation argument and a concentration compactness principle. Giovany M. Figueiredo Sandra I. Moreira Ricardo Ruviaro Copyright (c) 2021 Topological Methods in Nonlinear Analysis https://creativecommons.org/licenses/by-nd/4.0 2021-09-12 2021-09-12 335 349 10.12775/TMNA.2020.073