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Some Results on the Complex Oscillation Theory of Differential Equations with Polynomial Coefficients  
 
  Authors: Benharrat Belaidi, Karima Hamani,  
  Keywords: Differential equations, Order of growth, Exponent of convergence of distinct zeros, Wiman-Valiron theory.  
  Date Received: 08/10/03  
  Date Accepted: 20/10/04  
  Subject Codes:

34M10, 34M05, 30D35.

  
  Editors: Hari M. Srivastava,  
 
  Abstract:

In this paper, we study the possible orders of transcendental solutions of the differential equation $f^{left( nright) }+a_{n-1}left( zright) f^{left( n-1right) }+cdots +a_{1}left( zright) f^{prime }+a_{0}left( zright) f=0,$ where $a_{0}left( zright) ,dots ,$ $a_{n-1}left( zright) $ are nonconstant polynomials. We also investigate the possible orders and exponents of convergence of distinct zeros of solutions of non-homogeneous differential equation $f^{left( nright) }+a_{n-1}left( zright) f^{left( n-1right) }+cdots+a_{1}left( zright) f^{prime }+a_{0}left( zright) f=bleft( zright) ,$ where $a_{0}left( zright) ,dots ,$ $a_{n-1}left( zright) $ and $bleft( zright) $ are nonconstant polynomials. Several examples are given.;


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