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<HTML
><HEAD
><TITLE
></TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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BGCOLOR="#FFFFFF"
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ALINK="#0000FF"
><DIV
CLASS="ARTICLE"
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="JOELIB.DESCRIPTOR"
></A
>Descriptor</H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="JOELIB.DESCRIPTORS.ZAGREBINDEX2"
></A
>Zagreb index 2</H2
><P
>Zagreb index 2 [<A
HREF="bibliography.html#TC00"
>tc00</A
>].</P
><DIV
CLASS="EQUATION"
><A
NAME="AEN8"
></A
><P
><B
>Equation 1. Zagreb index 2</B
></P
><DIV
CLASS="MEDIAOBJECT"
><P
><IMG
SRC="formulas/zagreb2.gif"
ALIGN="CENTER"></P
></DIV
></DIV
><P
>where <SPAN
CLASS="bold"
><B
CLASS="EMPHASIS"
>b</B
></SPAN
> are all bonds of the hydrogen depleted graph and
<IMG
SRC="formulas/delta.gif"> is the vertex degree.
<SPAN
CLASS="bold"
><B
CLASS="EMPHASIS"
>i</B
></SPAN
> and <SPAN
CLASS="bold"
><B
CLASS="EMPHASIS"
>j</B
></SPAN
> are the atom indices
of the atoms connected to the bond <SPAN
CLASS="bold"
><B
CLASS="EMPHASIS"
>b</B
></SPAN
>.</P
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