Remark on infinite unramified extensions of number fields with class number one

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Remark on infinite unramified extensions of number fields with class number one

We modify an idea of Maire to construct biquadratic number fields with small root discriminants, class number one, and having an infinite, necessarily non-solvable, strictly unramified Galois extension. Let k be an algebraic number field with class number one. Then k has no Abelian (and hence no solvable) non-trivial unramified Galois extension. It is somewhat surprising that k may nevertheless...

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Let k be a number field. A natural question is: Does k admit an infinite unramified extension? The answer is no, if the root discriminant of k is less than Odlyzko’s bounds. The answer is yes, if k fails the test of Golod-Shafarevic for a prime number p. In that case, we know that there exists an infinite unramified p-extension L over k. But generally it is fairly difficult to determin whether ...

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ژورنال

عنوان ژورنال: Journal of Number Theory

سال: 2010

ISSN: 0022-314X

DOI: 10.1016/j.jnt.2009.08.013