The First Order World of Galton-Watson Trees
Consider the classic Galton-Watson tree T=Tc in which each node, independently, has Poisson mean c children. The probability f(c) that Tc is infinite is continuous, but it is not differentiable at the critical point c=1. Let, for example, g(c) be the probability that some node has precisely one child. This g(c) has derivatives of all orders and, indeed, is real analytic. We show that for a wide variety of properties, called First Order properties, the probability h(c) will be real analytic and, furthermore, can be found as the unique fixed point of a contraction Ψ on a compact set D. We introduce a notion of a property being “rapidly determined” and its effect on the corresponding probability function.
Speaker Details
Joel Spencer is a Professor at NYU, well known for key contributions to the probabilistic method in Combinatorics. For more details, see https://en.wikipedia.org/wiki/Joel_Spencer and http://www.cs.nyu.edu/spencer/
- Series:
- Microsoft Research Talks
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- Speakers:
- Joel Spencer
- Affiliation:
- Courant Institute, NYU
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