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A while ago, I was searching for a TeX package which would provide a double integral symbol with a circle which I could use to typeset some lecture notes on surface integrals. I happened upon the esint package, which includes several integral symbols I had never seen before. In particular, integral symbols with a square (\sqint and \sqiint), a sloped dash (\fint) and the very curious \landupint and \landdownint. Is anyone familiar with any uses for these symbols?


Added (TB) Here's an image of the integral signs in question:

integral signs

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