( ). : .
Ln n- j (). Ln = (1, 2, , n) . 1 = (11, 21, , n1) , j () , 1. 1 j () 1. (56) 1 = × × . . , , rang A = rang A1, .. .
63. , Ln .
, . . , :
66. , r , .. j = 12 + 22 + + r2.
, j () = 12 + 22 + + 2 +12 r2.
64. , (+1) , . (1) , (.. n r) .
67 ( ). , , .
. j () , = (1, 2, , n) Ln R, = 1 1 + 2 2 + + n n. . .
j = 12 + 22 + + 2 +12 r2 =
= z12 + z22 + + z2 z+12 zr2. (*)
= , = 1, 2, , n (**), z = , = 1, 2, , n (***).
, . , = . , ¹ . , , < . 1 = 2 = = = z+1 = = zr = zr+1 = = zn = 0. n + n . , . (10, 20, , n 0 ) . (**) (***), z (*). (+10)2 (r0)2 = (z10)2 +(z20)2 + +(z0)2. , +10 = = r0 = z10 = z20 = = z0 = 0. , z1 = z2 = = z = z+1 = = zr = zr+1 = = zn = 0 (10, 20, , n 0 ), , .. n. , . , = .
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9.5.
65. , ¹ 0 j () > 0.
68. , .
. Þ j () .
12 + 22 + + 2 +12 r2 (*),
r < n, r = n, < n. , , = (**). . r < n, 1 = 2 = = n1 = 0, n = 1 (**). n n , . . , , . j () = 0, . r = n, < n. , , 12 + 22 + + n2. , n.
Ü n. , .
.
69. , .
70. .
. n n - , = (1, 2, , n) , . = 1 1 + 2 2 + + n n, = 1 1 + 2 2 + + n n, (, ) = × × , , . , 2 = (, ) = × × . (60), , × × . n . 2 = 12 + 22 ++ n 2. , × × 12 + 22 ++ n 2. 68 , × × .
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. ?
1. 4 1 2 12 + 3 2 2 23 + 6 24.
2. 4 12 13 + 2 2 2 4 23 + 3 24 + 5 4 2.
3. 4 1 2 5 12 + 3 2 2 2 23 + 32 + 4 24 4 2.
. : . , .
1. 4 1 2 12 + 3 2 2 23 + 6 24 = (4 12 12 + ) + 3 2 2 23 + 6 24 =
= (2 1 )2 + (2 2
= (2 1 )2 + ( =
= (2 1 )2 + ( . , 3, .. , ( 68).
2. .
= , 1 = 0. , ( 69).
3. .
= , 1 = 4 > 0, 2 = = 5,75 > 0, 3 = 1,25 > 0,
4 = ½ ½= 14,25 > 0. , . , .