What does the symbol mean?

  • Thread starter romsofia
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Main Question or Discussion Point

http://arxiv.org/PS_cache/arxiv/pdf/1001/1001.3668v2.pdf

Equation (4), what does the symbol that looks like AND mean? I know it's not AND because it would make absolutely no sense in this case.

Thanks for any help!
 

Answers and Replies

  • #2
HallsofIvy
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  • #3
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Thank you very much!
 

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