zairaefh5755 zairaefh5755
  • 12-03-2024
  • Mathematics
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if r is a commutative ring and x1 , x2 , . . . , xn are independent variables over r, prove that is isomorphic to r[x1 , x2 , . . . , xn ] for any permutation of { 1 , 2, . . . , n}.

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