Extend Mean Curvature Flow with Finite Integral Curvature

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In this note, we first prove that the solution of mean curvature flow on a finite time interval [0,T) can be extended over time T if the space-time integration of the norm of the second fundamental form is finite. Secondly, we prove that the solution of certain mean curvature flow on a finite time interval [0,T) can be extended over time T if the space-time integration of the mean curvature is finite. Moreover, we show that these conditions are optimal in some sense.