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- Or a "layperson's definition" of those quantities.

I understand that for the experts it (probably) involves a lot, for me complex, math.

But I wonder if there's a well .. simplified way to describe and understand this.

I'm not even sure whether it can be defined in QFT, but I got this from SE:

Which I don't understand. I'm not mathematically sophisticated enough for that.

Which I don't understand. I'm not mathematically sophisticated enough for that.