Abstract
In this article we provide new applications for exponential approximation using the framework of Pekoz and Rollin (2011), which is based on Stein's method. We give error bounds for the nearly critical Galton-Watson process conditioned on non-extinction, and for the occupation times of Markov chains; for the latter, in particular, we give a new exponential approximation rate for the number of revisits to the origin for general two dimensional random walk, also known as the Erdos-Taylor theorem.
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