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On the multiples of a badly approximable vector

Yann Bugeaud (2015)

Acta Arithmetica

Let d be a positive integer and α a real algebraic number of degree d + 1. Set α ̲ : = ( α , α ² , . . . , α d ) . It is well-known that c ( α ̲ ) : = l i m i n f q q 1 / d · | | q α ̲ | | > 0 , where ||·|| denotes the distance to the nearest integer. Furthermore, c ( α ̲ ) n - 1 / d c ( n α ̲ ) n c ( α ̲ ) for any integer n ≥ 1. Our main result asserts that there exists a real number C, depending only on α, such that c ( n α ̲ ) C n - 1 / d for any integer n ≥ 1.

On the n -torsion subgroup of the Brauer group of a number field

Hershy Kisilevsky, Jack Sonn (2003)

Journal de théorie des nombres de Bordeaux

Given a number field K Galois over the rational field , and a positive integer n prime to the class number of K , there exists an abelian extension L / K (of exponent n ) such that the n -torsion subgroup of the Brauer group of K is equal to the relative Brauer group of L / K .

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