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Explicit construction of integral bases of radical function fields

Qingquan Wu (2010)

Journal de Théorie des Nombres de Bordeaux

We give an explicit construction of an integral basis for a radical function field K = k ( t , ρ ) , where ρ n = D k [ t ] , under the assumptions [ K : k ( t ) ] = n and c h a r ( k ) n . The field discriminant of K is also computed. We explain why these questions are substantially easier than the corresponding ones in number fields. Some formulae for the P -signatures of a radical function field are also discussed in this paper.

Exponent of class group of certain imaginary quadratic fields

Kalyan Chakraborty, Azizul Hoque (2020)

Czechoslovak Mathematical Journal

Let n > 1 be an odd integer. We prove that there are infinitely many imaginary quadratic fields of the form x 2 - 2 y n whose ideal class group has an element of order n . This family gives a counterexample to a conjecture by H. Wada (1970) on the structure of ideal class groups.

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