nd{array} \right)
\end{equation}
 -->
<TABLE WIDTH="100%" ALIGN="CENTER">
<TR VALIGN="MIDDLE"><TD ALIGN="CENTER" NOWRAP><A NAME="1.2.5"></A><IMG
 WIDTH="238" HEIGHT="58" BORDER="0"
 SRC="img65.png"
 ALT="\begin{displaymath}
\left( \begin{array}{c}
u_1 \\ u_2
\end{array} \right) =
...
...\left( \begin{array}{c}
v_1 \\ v_2\\ v_3
\end{array} \right)
\end{displaymath}"></TD>
<TD WIDTH=10 ALIGN="RIGHT">
(2.9)</TD></TR>
</TABLE>
<BR CLEAR="ALL"></DIV><P></P>
while in (<A HREF="node3.html#1.2.3">2.7</A>), we have
