Abstract
In this paper, we investigate the long time existence and uniqueness of small solution to d , for d = 2 , 3 , dimensional Prandtl system with small initial data which is analytic in the horizontal variables. In particular, we prove that d dimensional Prandtl system has a unique solution with the life-span of which is greater than ε − 4 3 if the initial data is of size ε and the value on the boundary of the tangential velocity of the outflow are of size ε 5 3 . We mention that the tool developed in [4] , [5] to make the analytical type estimates and the special structure of the nonlinear terms to this system play an essential role in the proof of this result.
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