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I was informed a new formula. As a non-native, I can't give out the definitons, I hope that you can help me call some.

Well, here is the formula:

[tex]\Delta=\frac{2+\Sigma n_i (V_i-2)}{2}[/tex]

Well, as far as I can say, [tex]\Delta[/tex] here is equal to the total of the linkage C=C+ number of 'cycles' in my language?

So, what is this for and how was it formed? I really want to know so that I can apply to my problems.

Thanks for your time and help!