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In my QFT course, the professor writes an infinite product like this:

∏_{n | k n0 > 0 }∫...

My question is, what does the `|' in the subscript "n | k" representing? When I see `|', I think logical OR - obviously that is not it. Normally, if it's a sum over two indices, commas separate the indices - not sure if `|' in place of a comma is standard notation or not.

Any ideas?

Thanks,

blankvin.

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# Infinite product notation

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