Y by Adventure10
Let
be a probability distribution on the set of nonnegative integers. Select a number according to this distribution and repeat the selection independently until either a zero or an already selected number is obtained. Write the selected numbers in a row in order of selection without the last one. Below this line, write the numbers again in increasing order. Let
denote the event that the number
has been selected and that it is in the same place in both lines. Prove that the events
are mutually independent, and
.
T. F. Mori





T. F. Mori