Variational principles using a non-symmetric non-triangular distance
We consider Borwein-Preiss and Ekeland variational principles using a distance function that neither is symmetric nor enjoy the triangular inequality. All the given results rely exclusively on the convergence and continuity behaviors induced synthetically by the distance function itself without any topological implications. At the end of the paper, we also present two applications; the Caristi fixed point theorem and an existence theorem for equilibrium problems.
Authors
- Parin Chaipunya (ORCID: https://orcid.org/0000-0002-0207-6098)
- Poom Kumam
- Natthaya Boonyam
Institutions
- King Mongkut's University of Technology Thonburi (TH)
Publication Details
- Journal
- Fixed Point Theory and Algorithms for Sciences and Engineering
- Published
- 2026-01-22
- DOI
- https://doi.org/10.1186/s13663-026-00824-w
- Primary Topic
- Optimization and Variational Analysis
- Type
- article
- Field-Weighted Citation Impact
- 0.00