Some remarks on the vector optimization method of Fandel

The paper investigates properties of the normal vectors of hyperplanes, applied in the interactive vector optimization method of Fandel. This work was inspirated by a numeric example or Rietveld. In this example the corresponding hyperplane can not be used for the determination of an efficient decision. For this case some conclusions will be given concerning the properties of the vector optimization problem. Furthermore two possibilities are proposed to continue the interactive method of Fandel if at the determination of the hyperplane this special case occurs.