Functional Equations and Inequalities: Topics and Applications
A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Mathematics".
Deadline for manuscript submissions: 28 February 2026 | Viewed by 20
Special Issue Editor
Interests: functional equations; functional inequalities; fuzzy logic; Hyers-Ulam stability; classical analysis
Special Issues, Collections and Topics in MDPI journals
Special Issue Information
Dear Colleagues,
We are pleased to invite you to contribute to this Special Issue on "Functional Equations and Inequalities: Topics and Applications". Functional equations and inequalities are pivotal in mathematics, providing essential tools for modelling and solving problems across a wide spectrum of scientific disciplines. Their study has led to significant theoretical breakthroughs and practical innovations, impacting fields from classical analysis and geometry to modern computer science and economics. Building on the continued interest and advancements in this area, this issue aims to capture the latest developments.
This Special Issue aims to present a collection of cutting-edge research that reflects the vibrancy and breadth of functional equations and inequalities. We seek to foster an exchange of ideas and showcase the power of these mathematical tools in addressing contemporary scientific challenges. The study of functional equations often involves inherent symmetries and structures, aligning well with the scope of many multidisciplinary and mathematical journals.
In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following:
- General solution methods for various types of functional equations and inequalities;
- Stability of functional equations;
- Functional equations on diverse algebraic and abstract structures (e.g., groups, Banach spaces, fuzzy settings);
- Applications of functional equations and inequalities in mathematics, physics, economics, engineering, information theory, and other sciences;
- Connections between functional equations and other mathematical disciplines such as operator theory, fixed point theory, and dynamical systems;
- Iterative functional equations and functional differential/integral equations.
I look forward to receiving your contributions.
Dr. Włodzimierz Fechner
Guest Editor
Manuscript Submission Information
Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.
Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.
Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.
Keywords
- functional equations
- functional inequalities
- stability theory
- Ulam stability
- fixed point theory
- difference equations
- operator theory
- applications of functional equations
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