We find viscosity solutions to the two membranes problem (that
is, a system with two obstacle-type equations) with two different
-Laplacian
operators taking limits of value functions of a sequence of games. We analyze
two-player zero-sum games that are played in two boards with different rules in each
board. At each turn both players (one inside each board) have the choice of playing
without changing board or changing to the other board (and then playing one round
of the other game). We show that the value functions corresponding to this kind of
game converge uniformly to a viscosity solution of the two membranes problem. If in
addition the possibility of having the choice to change boards depends on a coin toss
we show that we also have convergence of the value functions to the two membranes
problem that is supplemented with an extra condition inside the coincidence
set.
Keywords
two membranes problem, viscosity solutions, game theory