TAILIEUCHUNG - Báo cáo hóa học: "Research Article Iterative Methods for Generalized von Foerster Equations with Functional Dependence"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Iterative Methods for Generalized von Foerster Equations with Functional Dependence | Hindawi Publishing Corporation Journal ofInequalities and Applications Volume 2007 Article ID 12324 14 pages doi 2007 12324 Research Article Iterative Methods for Generalized von Foerster Equations with Functional Dependence Henryk Leszczynski and Piotr Zwierkowski Received 4 August 2007 Accepted 13 November 2007 Recommended by Patricia J. Y. Wong We investigate when a natural iterative method converges to the exact solution of a differential-functional von Foerster-type equation which describes a single population depending on its past time and state densities and on its total size. On the right-hand side we assume either Perron comparison conditions or some monotonicity. Copyright 2007 H. Leszczyriski and P. Zwierkowski. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction Von Foerster and Volterra-Lotka equations arise in biology medicine and chemistry 1-5 . The independent variables Xj and an unknown function u stand for certain features and densities respectively. It follows from this natural interpretation that Xj 0 and u 0. We are interested in the first model which is essentially nonlocal because it also contains the total size of population u t x dx. Existence results for certain von Foerster type problems has been established by means of the Banach contraction principle the Schauder fixed point theorem or iterative methods see 6-10 . Just because of nonlocal terms these methods demand very thorough calculations and a proper choice of subspaces of continuous and integrable functions. Sometimes it may cost some simplifications of the real model. On the other hand there is a very consistent theory of first-order partial differential-functional equation in 1113 based on properties of bicharacteristics and on the above-mentioned fixed-point techniques with respect to the uniform .

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