
We give a concise proof, using rescaling, random time change and simple infinitesimal generator computations of the fact that Brownian excursion is the weak limit as $\varepsilon \rightarrow 0$ of tied down Brownian motion conditioned never to fall below $-\varepsilon$.
60B10, infinitesimal generator, Brownian excursion, Bessel process, Transition functions, generators and resolvents, 60J65, Brownian motion, Convergence of probability measures, random time change
60B10, infinitesimal generator, Brownian excursion, Bessel process, Transition functions, generators and resolvents, 60J65, Brownian motion, Convergence of probability measures, random time change
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