These models and simulations have been tagged “Dennis-Sherwood”.
colony of frogs is living happily on one side of a large pond. At the other side of the pond is a lily
pad. One day, a chemical pollutant flows
into the pond, which has the effect of stimulating the growth of the lily pad
so that it doubles every 24 hours. This
is a problem for the frogs, for if the lily pad were to cover the pond
entirely, the frog colony would be wiped out.