$f\left(x_{k\mathrm{,}j}\right)$

$\cdots$

$f\left(x_{k\mathrm{,0}}\right)$

$f\left(x_{k-\mathrm{1,}n}\right)$

$\cdots$

$f\left(x_{k-\mathrm{1,0}}\right)$

$x_{k\mathrm{,}j}$

$\cdots$

$x_{k\mathrm{,0}}$

$x_{k-\mathrm{1,}n}$

$\cdots$

$x_{k-\mathrm{1,0}}$