Minimizing Rational Functions by Exact Jacobian SDP Relaxation   Applicable to Finite Singularities
  This paper considers the optimization problem of minimizing a rational function. We reformulate this problem as polynomial optimization by the technique of homogenization. These two problems are shown to be equivalent under some generic conditions. The exact Jacobian SDP relaxation method proposed by Nie is used to solve the resulting polynomial optimization. We also prove that the assumption of nonsingularity in Nie's method can be weakened as the finiteness of singularities. Some numerical examples are given to illustrate the efficiency of our method. 
Feng Guo, Li Wang, Guangming Zhou
math.OC