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I have been trying to find a definition for this symbol but so far I have found nothing. Is there some esoteric text that uses it?

Below is a page about the Unicode character for the symbol.

'LINE INTEGRATION WITH SEMICIRCULAR PATH AROUND POLE' (U+2A13) http://www.fileformat.info/info/unicode/char/2a13/index.htm

Given the Unicode description above of the character, it seems reasonably that the symbol has some relation to https://en.wikipedia.org/wiki/Residue_theorem . However that page doesn't define the symbol, and I haven't been able to find the symbol defined elsewhere. That's why I think it might exist in some esoteric text.

slartar
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  • We need to know your background to provide a suitable answer. Do you know complex analysis? – Chappers May 27 '17 at 21:29
  • @Chappers Yes I know complex analysis. – slartar May 27 '17 at 21:30
  • You have a lot of them http://graphemica.com/%E2%A8%93 clicking the arrows... – Rafa Budría May 27 '17 at 21:35
  • @RafaBudría Yea there are a lot of them there. I was assuming that because they exist there is probably some mathematical definition of the symbols somewhere – slartar May 27 '17 at 21:37
  • Only to hypothesize, maybe the symbol creators, whoever they could be, defined them in the possibility that somebody find them useful... – Rafa Budría May 27 '17 at 21:48
  • @RafaBudría That sounds plausible to me. I hope I can find a definition of it somewhere, or some explanation why there is no definition, if there is none. – slartar May 27 '17 at 21:53
  • Presumably, then, it is used when there is a pole on the integration contour, to write it in terms of integrals without singularities, such as in this question. I doubt it's ever actually used, though: the fanciest integral signs most people use are $\iint$, $\oint$ and their friends and occasionally an integral with a bar through it for principal value (surprisingly not available in latex without some work). – Chappers May 27 '17 at 21:55
  • You can just use a simple integration sign and clarify whatever you want to clarify with words. – Pedro May 27 '17 at 22:06
  • you have to look very carefully to distinguish $⨓$ and $⨔$ – Henry May 27 '17 at 22:11

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