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II. a A 1, 1 + a , .

n n + 1 1, a1, a 2,..., a n m n :

a m = k m1a m1 +... + k 2 a 2 + k1a + k 0 1 a m k m1a m1... k 2 a 2 k1a k 0 1 = 0. P1 (a )P2 (a )...Pm (a ) = 0, a . , 1 + a = 0 a 1, . a , .

III. a A, b A , Qa,b 1 + a + b + ab , . a b , a 2 = 1, b 2 = 1, ab + ba = 1, .

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