Fig. 4

Numerical solution to the bistable toggle switch problem with splitting topology. The threshold parameter p _threshold has been chosen to force the essential support evolve from a simple connected into a two-connected domain: (top) degrees of freedom (vertical axis) as a function of time (horizontal axis); (bottom) four panels represent the solution on various time stages: the initial conditions; solution shortly after the start; solution just before the split; and the final, steady state distribution supported on a two-connected domain