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Published online by Cambridge University Press: 24 August 2023
The Brownian bridge or Lévy–Ciesielski construction of Brownian paths almost surely converges uniformly to the true Brownian path. We focus on the uniform error. In particular, we show constructively that at level N, at which there are $d=2^N$ points evaluated on the Brownian path, the uniform error and its square, and the uniform error of geometric Brownian motion, have upper bounds of order
$\mathcal {O}(\sqrt {\ln d/d})$, matching the known orders. We apply the results to an option pricing example.
The authors acknowledge support of the Australian Research Council under project DP210100831. Michael Griebel acknowledges support from the Sydney Mathematical Research Institute.