$1\le j\le p_{\eta }$

$j=p_{\eta }+1$

i

$P_{i\mathrm{,}j}$

$w_{i\mathrm{,}j}$

$P_{i\mathrm{,}j}$

$w_{i\mathrm{,}j}$

1

$\left(\mathrm{0,0}\right)$

${\beta }_1$

$\left(x_1\mathrm{,}{y}_1\right)$

${\beta }_1$

2

$\left(\mathrm{0,0}\right)$

${\beta }_2$

$\left(x_2\mathrm{,}{y}_2\right)$

${\beta }_2$

$⋮$

$⋮$

$⋮$

$⋮$

$⋮$

$m-k$

$\left(\mathrm{0,0}\right)$

${\beta }_{m-k}$

$\left(x_{m-k}\mathrm{,}{y}_{m-k}\right)$

${\beta }_{m-k}$