I am learning QFT from Srednicki's book.(adsbygoogle = window.adsbygoogle || []).push({});

However, in Figure 9.2 Srednicki has given all connected diagrams with [itex]E=0[/itex] and [itex]V=4[/itex]. Are there any way to know the disconnected diagrams? Can you tell me what they are.

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# Disconnected Feynman Diagrams

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