The ∂ symbol is defined to be a 4-vector of the usual partial derivatives.pic.twitter.com/IOypGbR2Kg
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The ∂ symbol is defined to be a 4-vector of the usual partial derivatives.pic.twitter.com/IOypGbR2Kg
All free physical fields or fields in the interaction picture?
That's why I snuck the "physical" in there ;)
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