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zyfanlxsq金蟲 (小有名氣)
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[求助]
求助抽代題目~
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For a commutative ring M and ideal A, let N(A)={x in M|there exists a nonnegative integer n such that x^n in A}. Which of following is true for N(A)=A? I. M=Z, A=(2) II. M=Z[x], A=(x^2+2) III. M=Z/27Z, A=(18+27Z) G is a group, a and b are non-unit elements of G, ab=bba. If the subgroup of G generated by a has order 3, what about the order of the subgroup of G generated by b? (a) 3 (b) 5 (c) 7 (d) 9 (e) cannot determined by given information 求指點,求交流,謝謝大家。 |
木蟲 (小有名氣)
金蟲 (小有名氣)
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