We study Nevanlinna theory using stochastic calculus. We have a defect relation for holomorphic maps in equidimensional cases which includes Carlson and Griffiths′ defect relation. The main probabilistic methods used here are some estimates on some increasing processes for Brownian motion and martingales on manifolds. The latter is obtained from Krylov′s estimate on stochastic integrals for martingales.
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