I was reading a paper and encountered an integral where the differential, $dx$, was raised to the power $4$. What does this mean? Is this some kind of special integral?
$$\int d^4x$$
I was reading a paper and encountered an integral where the differential, $dx$, was raised to the power $4$. What does this mean? Is this some kind of special integral?
$$\int d^4x$$
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