ABSTRACT
Let us begin with an example. A group of n anglers are sitting around a pool. Each of them is fishing with his own fishing rod. Assume that everybody will be happy to catch just one fish. However, none of them will go away without a catch. It is evident that if there are enough fish in the pool, the number of fishermen sitting will decrease with time. We are interested to know how the decreasing number of anglers can be expressed as a function of time.
