### Convergence of some leader election algorithms

*Svante Janson, Christian Lavault, Guy Louchard*

#### Abstract

We start with a set of n players. With some probability
P(n,k),
we kill n-k players; the other ones stay alive, and we
repeat with them.
What is the distribution of the number X

_{n}of*phases*(or rounds) before getting only one player? We present a probabilistic analysis of this algorithm under some conditions on the probability distributions P(n,k), including stochastic monotonicity and the assumption that roughly a fixed proportion α of the players survive in each round. We prove a kind of convergence in distribution for X_{n}-log_{1/α}n; as in many other similar problems there are oscillations and no true limit distribution, but suitable subsequences converge, and there is an absolutely continuous random variable Z such that d(X_{n}, ⌈Z+log_{1/α}n⌉)→0, where d is either the total variation distance or the Wasserstein distance. Applications of the general result include the leader election algorithm where players are eliminated by independent coin tosses and a variation of the leader election algorithm proposed by W.R. Franklin 1982. We study the latter algorithm further, including numerical results.Full Text: PDF PostScript