# I need to find the gradient of this norm

by N3dOZEx
 P: 1 Hi. I have some problem in finding the gradient of this norm $\sum_{l = 1}^{n} \left ( (\nabla_{x} u)^{2}_{l} + (\nabla_{y} u)^{2}_{l} \right )^{1/2}$ I have some results to it but I'm not sure about it. Can you give me some insights for this. Thanks.