%0 Journal Article %T Smoothness criteria for Navier-Stokes equations in terms of regularity along the steam lines %A Chi Hin Chan %J Mathematics %D 2007 %I arXiv %X This article is devoted to a regularity criteria for solutions of the Navier-Stokes equations in terms of regularity along the stream lines. More precisely, we prove that a suitable weak solution for the Navier-Stokes equations is regular under some constraint on the second derivative of |u| along the stream lines. %U http://arxiv.org/abs/0711.5008v1