# What will be value of this differential? Kindly help and explain

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• ssafdarpk
ssafdarpk
Can someone help me understand the answer to this differential?

I have the following expression
where

Now what I can understand the differential of

what will be the following?

From these equations it seems $$\frac{\partial H_i^j}{\partial x}=0$$ holds. Could you tell me physical meaning or background of the first 4x4 quantity for further investigation ?