Contents of Volume 6, Number 3 July 1998
Asymptotic Constancy for Neutral Functional Differential Equations
O. ARINO AND M. PITUK
Pages 261 - 274
Group Invariant Solutions and Optimal System of Two Dimensional Wave Equation
SARITA VAISHAMPAYAN
Pages 275 - 288
Oscillatory and Nonoscillatory Behaviour of a Second Order Quasilinear Differential Equation
E. THANDAPANI AND M. MARIA SUSAI MANUEL
Pages 289 - 302
The Equivalence of P and P1 - Matrices in a Special Case
K. KISS
Pages 303 - 308
Positive Solutions and Nonlinear (k,n-k) Conjugate Eigenvalue Problems
PAUL W. ELOE AND JOHNNY HENDERSON
Pages 309 - 318
On Periodic Cycles of the Lyness Equations
YU ZHENG
Pages 319 - 324
Bounded Solutions of Abstract Difference Equations of the Second Order and Applications
A.H. NASR
Pages 325 - 332
Qualitative Analysis of a Two-Predator-One-Prey Competition Model with Delays
WEN XIANZHANG, WANG ZHICHENG AND YU JIANSHE
Pages 333 - 348
Computing the Poincare-Liapunov Constants
M A M ALWASH
Pages 349 - 362
Instability of Nonautonomous Differential Systems
RAŚL NAULIN
Pages 363