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Basic Chemistry problem

  1. Feb 15, 2005 #1
    Well, hello!
    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!
  2. jcsd
  3. Feb 15, 2005 #2
    Ah, by the way, We have:
    If [tex]\Delta =0[/tex], the subtance is not 'full' so; it has no [tex]\pi_{cc}[/tex] linkage, no 'cycle.
    If [tex]\Delta =1[/tex], the subtance has 1 [tex]\pi_{cc}[/tex] linkage OR 1 'cycle'
    If [tex]\Delta =2[/tex], the subtace has 2 [tex]\pi_{cc}[/tex] linkages OR 1 [tex]\pi_{cc}[/tex] linkage + 1 'cycle' OR 2 'cycles'
    So, what is this all about?
    Thanks again!
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