J
John R. Graef
Researcher at University of Tennessee at Chattanooga
Publications - 83
Citations - 1881
John R. Graef is an academic researcher from University of Tennessee at Chattanooga. The author has contributed to research in topics: Nonlinear system & Differential equation. The author has an hindex of 22, co-authored 83 publications receiving 1787 citations. Previous affiliations of John R. Graef include Mississippi State University.
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Global dynamics of a SEIR model with varying total population size.
TL;DR: A SEIR model for the transmission of an infectious disease that spreads in a population through direct contact of the hosts is studied and a unique endemic equilibrium state is shown to be globally asymptotically stable in the interior of the feasible region.
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Third order boundary value problems with nonlocal boundary conditions
John R. Graef,J. R. L. Webb +1 more
TL;DR: In this paper, the existence of multiple positive solutions for a third order boundary value problem with nonlocal boundary conditions is treated as a linear functional on C[0, 1], that is, given by a Stieltjes integral but not necessarily a positive functional.
Journal Article
Positive solutions of a nonlinear higher order boundary-value problem
TL;DR: In this paper, the authors considered the higher order boundary value problem u (n) (t) = q(t)f(u(t)), 0 t 1, where n 4 is an integer, and p 2 (1/2,1) is a constant.
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Positive solutions to a multi-point higher order boundary value problem
John R. Graef,Bo Yang +1 more
TL;DR: In this paper, a higher order multi-point boundary value problem is considered and existence and nonexistence results for positive solutions of the problem are obtained by using Krasnosel'skii's fixed point theorem.