254-272), where the authors show the existence of a global attractor for this type of reaction-diffusion systems. Kapustyan, published in Journal of Mathematical Analysis and Applications (vol. Antecedents of this research areД¬ontained in two papers by J. More exactly, a weak comparison principle for a reaction-diffusion system in which the nonlinear term satisfies suitable dissipative and growth conditions, ensuring existence of solutions but not uniqueness, is established. The paper 'A weak comparison principle for reaction-diffusion systems' deals with certain differential equations for which uniqueness of the Cauchy problem fails. This special issue addresses work at the interface between function spaces, hyperspaces, fuzzy structures, and asymmetric topology. Many of the impactful and highly cited papers in general topology and its applications have been published in the realm of this relationship. The interplay between fuzzy structures and the theory of hyperspaces and the asymmetric topology is a topic of broad appeal, encouraging new research on such topics and in many cases defining emerging research directions and laying the foundation for future innovations. Hyperspaces, asymmetric topology and fuzzy structures are interdisciplinary topics of increasing interest in the development of the general topology, and its applications in other areas of Mathematics and computer science, such as convex analysis and optimization, fractals and dynamical systems, mathematical economics, and image computing. Zadeh proposed in the sixties his theory of fuzzy sets, this subject became a productive field of research: fuzzy structures not only generalize most of the familiar structures but also they allow obtaining interesting applications in engineering. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Salvador Romaguera,1 Gerald Beer,2 and Manuel Sanchis3ДЎ Instituto Universitario de MatemГЎtica Pura y Aplicada, Universitat PolitГ©cnica de Valencia, 46022 Valencia, SpainДўДќepartment of Mathematics, California State University, Los Angeles, CA 90032, USAДЈ Institut de Matematiques i Aplicacions de CastellГЎ (IMAC), Universitat Jaume I, Campus del Riu Sec S/N, 12071 CastellГЎ, Spain Correspondence should be addressed to Salvador Romaguera 2 April 2013 Accepted 2 April 2013Д¬opyright В© 2013 Salvador Romaguera et al. п»їHindawi Publishing Corporation Journal of Function Spaces and Applications Volume 2013, Article ID 619707, 2 pages ДЇunction Spaces, Hyperspaces, and Asymmetric and Fuzzy Structures

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