On unit groups of algebraic number fields
نویسندگان
چکیده
منابع مشابه
Algebraic number fields
By an algebraic number field we mean a subfield of the algebraic numbers, or an isomorphic copy of such a field. Here we consider questions related to the complexity of determining isomorphism between algebraic number fields. We characterize the algebraic number fields with computable copies. For computable algebraic number fields, we give the complexity of the index sets. We show that the isom...
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In this chapter, we study algebraic groups, especially nonsplit reductive groups, over arbitrary fields. The algebraic groups over a field k that become isomorphic to a fixed algebraic group over kal are classified by a certain cohomology group. In the first section, we explain this, and discuss what is known about the cohomology groups. Over an algebraically closed field, the classical semisim...
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ژورنال
عنوان ژورنال: Proceedings of the Japan Academy, Series A, Mathematical Sciences
سال: 1988
ISSN: 0386-2194
DOI: 10.3792/pjaa.64.345