https://ph03.tci-thaijo.org/index.php/jnao/issue/feedJournal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO)2025-06-30T00:00:00+07:00Issara Inchanpeissara@uru.ac.thOpen Journal Systems<p><strong>Journal of Nonlinear Analysis and Optimization: Theory & Applications</strong> is a peer-reviewed, open-access international journal, that devotes to the publication of original articles of current interest in every theoretical, computational, and applicational aspect of nonlinear analysis, convex analysis, fixed point theory, and optimization techniques and their applications to science and engineering. All manuscripts are refereed under the same standards as those used by the finest-quality printed mathematical journals. Accepted papers will be published in two issues annually in June and December, free of charge. This journal was conceived as the main scientific publication of the Center of Excellence in Nonlinear Analysis and Optimization, Naresuan University, Thailand.</p>https://ph03.tci-thaijo.org/index.php/jnao/article/view/3244NONLINEAR VARIATIONAL INCLUSIONS INVOLVING (A, η) MONOTONE MAPPINGS IN HILBERT SPACES2025-05-17T21:50:01+07:00T. Ramtir1ram2@yahoo.comM. Iqbaliqbalmohd486@gmail.com<p>In this work, we consider the nonlinear variational inclusion problem (NVIP) in real Hilbert spaces, which involves (A, η)-monotone mappings. We propose an iterative algorithm for finding the approximate solution to (NVIP) by using the resolvent operator technique, and we also explore the convergence criteria of the sequence generated by the resolvent iterative algorithm under some appropriate conditions.</p>2025-06-30T00:00:00+07:00Copyright (c) 2025 Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO)https://ph03.tci-thaijo.org/index.php/jnao/article/view/3555ON COMMON FIXED POINT THEOREMS FOR UNIFORMLY ASYMPTOTICALLY QUASI-NONEXPANSIVE MAPPINGS IN HYPERBOLIC SPACES2025-05-25T13:35:55+07:00B. Nuntadilokorburaskn@mju.ac.thP. Kingkampitchaya@g.lpru.ac.th<p>The aim of this manuscript is to establish a common fixed point theorem for two uniformly L-Lipschitzian and asymptotically quasi-nonexpansive non-self maps with respect to retraction P via implicit algorithm and to prove common fixed point results of two weakly inward and asymptotically quasi-nonexpansive mappings with respect to P satisfying condition (A) and condition (B), in a more general set up of hyperbolic space. Our results generalize, extend and improve some related results in the existing literature.</p>2025-06-30T00:00:00+07:00Copyright (c) 2025 Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO)https://ph03.tci-thaijo.org/index.php/jnao/article/view/3235NEW ASPECT FOR FIXED POINT THOERY ON ULTRAMETRIC SPACE2025-02-24T15:14:10+07:00Ö. Acarozlem.acar@selcuk.edu.trT. Delentugcedelen@yahoo.comA. S. Özkapuaybalasevdeozkapu.007@yahoo.com<p>In this paper, we prove some fixed point theorems using different types of contractions with special functions and also give an example to illustrate our results.</p>2025-06-30T00:00:00+07:00Copyright (c) 2025 Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO)https://ph03.tci-thaijo.org/index.php/jnao/article/view/3048SCHAUDER BASIS AND SEQUENCER SPACES IN GENERAL TOPOLOGICAL VECTOR SPACES2025-02-04T22:48:12+07:00C. G. Moorthyganesamoorthyc@gmail.comI. R. Saminathansir@loyolacollege.edu<p>Minkowski functionals of balanced neighbourhoods of zero are used to define sequence spaces in which sequences are sequences in general non locally convex topological vector spaces. The classical result “Every basis in a complete metrizable \linebreak topological vector space is a Schauder basis” is generalized for such sequence spaces.</p>2025-06-30T00:00:00+07:00Copyright (c) 2025 Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO)