Electronic Journal of Differential Equations,
Vol. 2000(2000), No. 76, pp. 1-11.

Title: Transformation to Lienard form

Authors:  W. A. Albarakati (King Abdulaziz Univ., Saudi Arabia)
 N. G. Lloyd, (Univ. of Wales, UK)
 J. M. Pearson (Univ. of Wales, UK)
          
Abstract: 
 We show that certain two-dimensional differential systems can be
 transformed to a system of Li\'{e}nard type. This enables known criteria for
 the existence of a centre for Li\'{e}nard systems to be exploited, so
 extending the range of techniques which are available for proving that
 conditions which are known to be necessary for a centre are also
 sufficient.
 
Submitted October 31, 2000. Published December 22, 2000.
Math Subject Classifications: 34CO7.
Key Words: Ordinary differential equations; polynomial systems; 
           Lienard systems.