It is proved that no convex and Fréchet differentiable function on $c_0(\omega_1)$, whose derivative is locally uniformly continuous, attains its minimum at a unique point.
Referencias bibliográficas
R. Deville, G. Godefroy, V. Zizler, Smoothness and Renormings in Banach Spaces, Pitman Monographs and Surveys in Pure and Applied...