tailieunhanh - Báo cáo hóa học: " Research Article On the Integrability of Quasihomogeneous Systems and Quasidegenerate Infinity Systems"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article On the Integrability of Quasihomogeneous Systems and Quasidegenerate Infinity Systems | Hindawi Publishing Corporation Advances in Difference Equations Volume 2007 Article ID 98427 10 pages doi 2007 98427 Research Article On the Integrability of Quasihomogeneous Systems and Quasidegenerate Infinity Systems Yanxia Hu Received 9 February 2007 Accepted 21 May 2007 Recommended by Kilkothur Munirathinam Tamizhmani The integrability of quasihomogeneous systems is considered and the properties of the first integrals and the inverse integrating factors of such systems are shown. By solving the systems of ordinary differential equations which are established by using the vector fields of the quasihomogeneous systems one can obtain an inverse integrating factor of the systems. Moreover the integrability of a class of systems quasidegenerate infinity systems which generalize the so-called degenerate infinity vector fields is considered and a method how to obtain an inverse integrating factor of the systems from the first integrals of the corresponding quasihomogeneous systems is shown. Copyright 2007 Yanxia Hu. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction We consider quasihomogeneous autonomous systems which are also called similarity invariant systems or weighted homogeneous systems that is the following nth order autonomous system of differential equations dx- Xi x i 1 2 dt n where x x1 x2 . xn G D c Rn or Cn Xi D R or C Xi G C-JD and t G R or C . System is invariant under the similarity transformation x x1 x2 . xn t ap1 x1 ap2x2 . apnxn a-lt for all a G R 0 wherep1 p2 . pn and l are positive integers. In other words Xi x are pi i 1 2 . n quasihomogeneous functions of weighted degrees pi l respectively that is Xi ap1 x1 . apnxn api lXi x1 . xn 2 Advances in Difference Equations for all a e R 0 . We also say that system is pi i 1 2 . n quasihomogeneous of .

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