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This tag is for questions on the meaning, history, and usage of various symbols and notation that are used to denote different quantities in physics. Don't forget to mention the reference, where you encountered those notations.
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What is the Cauchy principal value in Sokhotski-Plemelj formula?
I met the Sokhotski-Plemelj formula in a paper:
in which $P$ is the Cauchy principal value. But the principal value in wiki is this form:
It is a limit of an integration. But the $P$ in the first fo …