Existence of Fixed Point for Generalized Weak ψ-Contraction Mapping in Partially Ordered  b-Metric spaces with Applications to Nonlinear Volterra Integral Equation

This paper establishes novel fixed point existence theorems for self-mappings satisfying generalized weak ψ-contraction within the framework of partially ordered b- metric spaces. Furthermore, to validate the theoretical result, an application to a class of nonlinear Volterra integral equation is provided.