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## Main Question or Discussion Point

I'm reading thru Brown's QFT.

He uses the notation of the gradient operator or a partial differentiation operater with an arrow over the operator. The arrow points either left or right.

Can someone please tell me what this means?

thanks

He uses the notation of the gradient operator or a partial differentiation operater with an arrow over the operator. The arrow points either left or right.

Can someone please tell me what this means?

thanks