%0 Journal Article %T Stability in $L^1$ of circular vortex patches %A Thomas C. Sideris %A Luis Vega %J Mathematics %D 2009 %I arXiv %X The motion of incompressible and ideal fluids is studied in the plane. The stability in $L^1$ of circular vortex patches is established among the class of all bounded vortex patches of equal strength without any restriction on the size of the initial perturbation. %U http://arxiv.org/abs/0909.4111v1