Chen, G. Y.; Huang, X. X.; Lee, G. M. - In: Mathematical Methods of Operations Research 49 (1999) 1, pp. 125-136
In [1], we gave a unified variational principle for vector valued functions. In this paper, we give four equivalents of … the unified variational principle, we obtained a fixed point theorem for directional contractions as an application of our … vector variational principle, generalizing a fixed point theorem for directional contractions in [9]. Copyright Springer …