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In this paper we obtain a closed form expression of the expected exit time of a Brownian motion from equilateral triangles.We consider first the analogous problem for a symmetric random walk on the triangular latticeand show that it is equivalent to the ruin problem of an appropriate three player game.A suitable scaling of this random walk allows us to exhibit explicitly the relation betweenthe respective exit times. This gives us the solution of the related Poisson equation.
Applied Mathematics & Optimization – Springer Journals
Published: Dec 1, 2004
Keywords: Exit time; Random walk; Brownian motion; Poisson equation
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