Analyzing Helmholtz phenomena for mixed boundary values via graphically controlled contractions

• Published in: Mathematical modelling and analysis Vol. 30; no. 2; pp. 342 - 361
• Main Authors: Younis, Mudasir, Ahmad, Haroon, Asmat, Farwa, Öztürk, Mahpeyker
• Format: Journal Article
• Language: English
• Published: Vilnius Gediminas Technical University 24.04.2025
• Subjects: Boundary value problems; directed graph; Fixed point theory; fixed-point; Graph theory; Helmholtz phenomena; mixed boundary conditions graphic-contractions; Turkey; mixed boundary conditions graphic-contractions; directed graph; Helmholtz phenomena; fixed-point
• ISSN: 1392-6292; 1648-3510
• DOI: 10.3846/mma.2025.22546

Helmholtz’s problem helps us to completely understand how sound behaves in a cylinder that is closed from one of its ends and opened at another. This paper aims to employ some novel convergence results to the Helmholtz problem with mixed boundary conditions and demonstrate the existence and uniqueness of the solution by applying graph-controlled contractions. For this purpose, we enunciate graphically Reich type and graphically Ćirić type contractions in the realm of graphical-controlled metric type spaces. In our study, we showcase the existence and uniqueness of fixed point results by employing these graphical contractions. This is demonstrated through extensive examples that a graphicalcontrolled metric-type space is distinct from traditional controlled metric-type spaces. We also exhibit an example of a graphically Reich contraction that is not a classical Reich contraction. Similarly, a decent example of graphical Ćirić contraction is presented, which is distinct from the classical Ćirić contraction. Concrete illustrative examples solidify our theoretical framework.