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Cyclic subgroups of ideal class groups in real quadratic orders

Published online by Cambridge University Press:  19 July 2001

R. A. Mollin
Affiliation:
Mathematics Department, University of Calgary, Calgary, Alberta, Canada, T2N 1N4. E-mail: ramollin@math.ucalgary.ca
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Abstract

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The primary purpose of this paper is to provide general sufficient conditions for any real quadratic order to have a cyclic subgroup of order n∈ℕ in its ideal class group. This generalizes results in the literature, including some seminal classical works. This is done with a simpler approach via the interplay between the maximal order and the non-maximal orders, using the underlying infrastructure via the continued fraction algorithm. Numerous examples and a concluding criterion for non-trivial class numbers are also provided. The latter links class number one criteria with new prime-producing quadratic polynomials.

Type
Research Article
Copyright
1999 Glasgow Mathematical Journal Trust