In some note I see the integral sign: $\int$ with sigma $\Sigma$ over it. I've never seen this before. When I had analysis I never had it neither.
What is it suppose to mean $\Sigma\!\!\!\!\!\int$ subject is quantum field theory?
2026-03-26 16:10:13.1774541413
Meaning of symbol: $\Sigma\!\!\!\!\!\int$ (superimposion of integral sign with capital sigma) in QFT
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