TD>
<TD WIDTH=10 ALIGN="RIGHT">
(2.5)</TD></TR>
</TABLE>
<BR CLEAR="ALL"></DIV><P></P>
which has the structural form
<BR>
<DIV ALIGN="RIGHT">

<!-- MATH
 \begin{equation}
f_1 (v_1, v_2, v_3) = (v_1 + v_2 - 2v_3) e^{v_{1} - v_{3}},
\end{equation}
 -->
<TABLE WIDTH="100%" ALIGN="CENTER">
<TR VALIGN="MIDDLE"><TD ALIGN="CENTER" NOWRAP><A NAME="1.2.2"></A><IMG
 WIDTH="258" HEIGHT="16" BORDER="0"
 SRC="img41.png"
 ALT="\begin{displaymath}
f_1 (v_1, v_2, v_3) = (v_1 + v_2 - 2v_3) e^{v_{1} - v_{3}},
\end{displaymat