- 2


1 0 0 0

P00 P01 . . . . P0, n- k- 1

G =

0 1 0 0

P10 P11 . . . . P1, n- k- 1

 

 

. (1.10)

0 0 0 1

Pk- 1, 0 Pk- 1, 1 . . . . Pk- 1, n- k- 1

 

 

I

k*k

k*(n- k)

 

. (n,k)- G

k *

n

. G, ꠠ G - .

m = (m0 , m1 ,. . . , mk -1) -, .

U

U = m× G

. (1.11)

G U :

i = 0, 1, 2,. . . , k- 1

Ui

= mi ; (1.12)

i = k, k+1,. . . , n

Ui = m0× P0j + m1× P1j + m2× P2j ++ mk- 1× Pk- 1, j . (1.13)

, k , 堠 (n - ) .

(n,k)- , G .

(7,4)- , .

m = (m0, m1, m2, m3) , , .