# Curves of positive solutions of boundary value problems on time-scales

Fordyce A. Davidson, Bryan P. Rynne

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

## Abstract

Let T ? R be a time-scale, with a = inf T, b = sup T. We consider the nonlinear boundary value problem - [p(t)u?(t)]? + q(t) us(t) = ?f(t, us(t)), on T, u(a) = u(b) = 0, where ? ? R+ :=[0, 8), and f : T × R ? R satisfies the conditions f(t, ?) > 0, (t, ?) ? T × R, f(t, ?) > f? (t, ?) ?, (t, ?) ? T × RM+. We prove a strong maximum principle for the linear operator defined by the left-hand side of (1), and use this to show that for every solution (?, u) of (1)-(2), u is positive on T \ {a,b}. In addition, we show that there exists ?max > 0 (possibly ?max = 8), such that, if 0 = ? < ?max then (1)-(2) has a unique solution u(?), while if ? = ? max then (1)-(2) has no solution. The value of ?max is characterised as the principal eigenvalue of an associated weighted eigenvalue problem (in this regard, we prove a general existence result for such eigenvalues for problems with general, nonnegative weights). © 2004 Elsevier Inc. All rights reserved.

Original language English 491-504 14 Journal of Mathematical Analysis and Applications 300 2 https://doi.org/10.1016/j.jmaa.2004.07.012 Published - 15 Dec 2004

## Keywords

• Nonlinear boundary value problem
• Positive solutions
• Strong maximum principle
• Time-scales
• Weighted eigenvalue problem

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