Vol. 83, No. 1, 1979
Recent Issues
Vol. 325: 1
Vol. 324: 1  2
Vol. 323: 1  2
Vol. 322: 1  2
Vol. 321: 1  2
Vol. 320: 1  2
Vol. 319: 1  2
Vol. 318: 1  2
Online Archive
Volume:
Issue:
     
The Journal
Subscriptions
Editorial Board
Officers
Contacts
 
Submission Guidelines
Submission Form
Policies for Authors
 
ISSN: 1945-5844 (e-only)
ISSN: 0030-8730 (print)
Special Issues
Author Index
To Appear
 
Other MSP Journals
Comparison theorems for delay differential equations

Wadi Mahfoud
Vol. 83 (1979), No. 1, 187–197
DOI: 10.2140/pjm.1979.83.187
Abstract

Comparison Theorems. This paper presents a technique for extending some oscillation results from ordinary to delay differential equations. According to the technique, if an oscillation result is known for the ordinary differential equation

x(n) + f(t,x) = 0,

the corresponding result for the delay differential equation

x(n)(t)+ f(t,x(q(t))) = 0

may be obtained by a simple change of variables.
Mathematical Subject Classification
Primary: 34K15
Milestones
Received: 21 March 1978
Revised: 20 March 1979
Published: 1 July 1979
Authors
Wadi Mahfoud