TY - JOUR AU - Ky Fan TI - On the Equilibrium Value of a System of Convex and Concave Functions. JO - Mathematische Zeitschrift PY - 1958 SP - 271 EP - 280 VL - 70 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZ_1958__70_169776/ ID - MZ_1958__70_169776 ER -