Look at the page 256. relation (6.93).(adsbygoogle = window.adsbygoogle || []).push({});

http://books.google.rs/books?id=vrc...page&q=Nolting spin product of graphs&f=false

What is even vertex? Can you explain me in term of graphical representation of spin product. Are those products in the bottom of page 256 is equal to zero?

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# Spin problem

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