ORDER="0"
 SRC="img29.png"
 ALT="$f_j$">
is assumed  to be a function of the
problem variables <IMG
 WIDTH="14" HEIGHT="16" ALIGN="MIDDLE" BORDER="0"
 SRC="img30.png"
 ALT="$\bar{x}_j$">, a  subset of the overall variables <IMG
 WIDTH="9" HEIGHT="8" ALIGN="BOTTOM" BORDER="0"
 SRC="img31.png"
 ALT="$x$">.
Suppose that <IMG
 WIDTH="14" HEIGHT="16" ALIGN="MIDDLE" BORDER="0"
 SRC="img32.png"
 ALT="$\bar{x}_j$"> has  <IMG
 WIDTH="15" HEIGHT="13" ALIGN="MIDDLE" BORDER="0"
 SRC="img33.png"
 ALT="$n_j$"> components