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I don't know if analysis is the right place for me to post this thread therefore please accept my apologies in advance if I am mistaken.

In graph theory the incidence function that associates vertices & edges http://img41.imageshack.us/img41/8171/32004284.jpg [Broken], in the text it has following notation http://books.google.co.uk/books?id=...ce=gbs_ge_summary_r&cad=0#v=onepage&q&f=false at page 2, what do we call to this notation? (it's a v divided by a straight vertical line in the middle)

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# Graph theory - notation problem

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