RT Journal Article T1 On the von Neumann problem and the approximate controllability of Stackelberg-Nash strategies for some environmental problems A1 Díaz Díaz, Jesús Ildefonso AB Two problems arising in Environment are considered. The first one concerns a conjecture possed by von Neumann in 1955 on the possible modification of the albedo in order to control the Earth surface temperature. The second one is related to the approximate controllability of Stackelberg-Nash strategies for some optimization problems as, for instance, the pollution control in a lake. The results of thesecondpart were obtained in collaboration with Jacques-LouisLions. PB Springer SN 1578-7303 YR 2002 FD 2002 LK https://hdl.handle.net/20.500.14352/59646 UL https://hdl.handle.net/20.500.14352/59646 LA eng NO DGES(Spain) DS Docta Complutense RD 9 abr 2025