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## Main Question or Discussion Point

Look at the page 256. relation (6.93).

http://books.google.rs/books?id=vrcHC9XoHbsC&pg=PA256&lpg=PA256&dq=Nolting+spin+product+of+graphs&source=bl&ots=5uRIg5aDIj&sig=sawJYioGHevsuCjxs-NNv_OxSrY&hl=sr#v=onepage&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?

http://books.google.rs/books?id=vrcHC9XoHbsC&pg=PA256&lpg=PA256&dq=Nolting+spin+product+of+graphs&source=bl&ots=5uRIg5aDIj&sig=sawJYioGHevsuCjxs-NNv_OxSrY&hl=sr#v=onepage&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?