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The degree of Kummer extensions of number fields
International Journal of Number Theory ( IF 0.5 ) Pub Date : 2020-10-29 , DOI: 10.1142/s1793042121500263 Antonella Perucca 1 , Pietro Sgobba 1 , Sebastiano Tronto 1
International Journal of Number Theory ( IF 0.5 ) Pub Date : 2020-10-29 , DOI: 10.1142/s1793042121500263 Antonella Perucca 1 , Pietro Sgobba 1 , Sebastiano Tronto 1
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Let K be a number field, and let α 1 , … , α r be elements of K × which generate a subgroup of K × of rank r . Consider the cyclotomic-Kummer extensions of K given by K ( ζ n , α 1 n 1 , … , α r n r ) , where n i divides n for all i . There is an integer x such that these extensions have maximal degree over K ( ζ g , α 1 g 1 , … , α r g r ) , where g = gcd ( n , x ) and g i = gcd ( n i , x ) . We prove that the constant x is computable. This result reduces to finitely many cases the computation of the degrees of the extensions K ( ζ n , α 1 n 1 , … , α r n r ) over K .
中文翻译:
数域的 Kummer 扩展度
让ķ 是一个数字域,让α 1 , … , α r 成为元素ķ × 生成一个子组ķ × 等级r . 考虑 cyclotomic-Kummer 扩展ķ 由ķ ( ζ n , α 1 n 1 , … , α r n r ) , 在哪里n 一世 划分n 对所有人一世 . 有一个整数X 使得这些扩展有最大程度超过ķ ( ζ G , α 1 G 1 , … , α r G r ) , 在哪里G = gcd ( n , X ) 和G 一世 = gcd ( n 一世 , X ) . 我们证明了常数X 是可计算的。这个结果将扩展度的计算减少到有限多的情况ķ ( ζ n , α 1 n 1 , … , α r n r ) 超过ķ .
更新日期:2020-10-29
中文翻译:
数域的 Kummer 扩展度
让