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In this article, we prove the global well-posedness in the critical Sobolevspace $H_{rad}^2\left(\mathbb{R}^2\right) \times H_{rad}^1\left(\mathbb{R}^2\right)$ for the radial time-like extremal hypersurfaceequation in $\left(1+3\right)$- dimensional Minkowski space-time. This isachieved by deriving a new div-curl type lemma and combined it with energy and``momentum" balance law to get some space-time estimates of the nonlinearity.

Global well-posedness for radial extremal hypersurface equation in $\left(1+3 \right)$-dimensional Minkowski space-time in critical Sobolev space