TY - JFULL AU - Li Feng PY - 2011/1/ TI - Computing Center Conditions for Non-analytic Vector Fields with Constant Angular Speed T2 - International Journal of Mathematical and Computational Sciences SP - 2031 EP - 2034 VL - 5 SN - 1307-6892 UR - https://publications.waset.org/pdf/7301 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 60, 2011 N2 - We investigate the planar quasi-septic non-analytic systems which have a center-focus equilibrium at the origin and whose angular speed is constant. The system could be changed into an analytic system by two transformations, with the help of computer algebra system MATHEMATICA, the conditions of uniform isochronous center are obtained. ER -