W. x W . , . V. x W , y V . , . .
.
V W. W, V. . [ x ] e = T [ x ] h [ y ] f = Q [ y ] g. . , .
.
, W V. . , . 0, . . . , .
W, V, U P, W V, - V U. W U . - W, - V, - U, .
.
A B , Q T, A = QBT.
6.1. , .
. , . , . , .
6.2. A , - k, 0 .
. A . , .
1. r =1.
2. 4, 3.
3. , i = r +1,, m, , j = r +1,, n, . r 1 2.
4. , i = r +1,, m, j = r +1,, n, . i, j > r, . , 2.
, , .
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6.3. A B , .
. , ( 6.1). . , , r = rgA = rgB ( 6.2). , , A B .
, .