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(4.15), (4.16) j=1,..., n+1, .. x 1,..., xn, .

, j=1,...,n, n. (4.15) (4.16), :

,   (4.17)

k = 1,..., n-1 - ; i = k+1,...,n; j = 1,2,...,n.

i k+1, , . (4.17) , , , :

...
  ...
    ...
... ... ... ... ... ...
      ...
      ...  

(4.17) ; - , . .

, , , k- kk , k- k- . , , .





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