On a theorem of Ky Fan and its application to nondifferentiame optimization
W. Schibotzek · Optimization · 1985
A theorem of Ky Fan is reformulated to yield a Farkas type result for infinite systems of sublinear functionals. By applying this result, necessary optimality conditions are established for minimization problems in normed vector spaces with objective and constraint functionals that are not necessarily convex or differentiable.