![quantum field theory - In Srednicki's book, when calculating loop corrections to the propagator, why doesn't he include both diagram topologies at second order? - Physics Stack Exchange quantum field theory - In Srednicki's book, when calculating loop corrections to the propagator, why doesn't he include both diagram topologies at second order? - Physics Stack Exchange](https://i.stack.imgur.com/s3I2W.png)
quantum field theory - In Srednicki's book, when calculating loop corrections to the propagator, why doesn't he include both diagram topologies at second order? - Physics Stack Exchange
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