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Mathematics of Computation
Mathematics of Computation
ISSN 1088-6842(online) ISSN 0025-5718(print)

 

Determining the fundamental unit of a pure cubic field given any unit


Authors: N. S. Jeans and M. D. Hendy
Journal: Math. Comp. 32 (1978), 925-935
MSC: Primary 12A30; Secondary 12A45
MathSciNet review: 0472761
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Abstract: A number of algorithms which have been used to derive fundamental units for pure cubic fields suffer from the lack of absolute certainty that the units obtained are fundamental. We present here an algorithm which will correct this deficiency. Briefly, if $ \eta $ is any nontrivial unit of a pure cubic field, then for some positive integer $ N, {\eta ^{1/N}}$ will be a fundamental unit. Our method determines which of the real numbers $ {\eta ^{1/N}}$ are integers of the field and, subsequently, will determine the coefficients of the fundamental unit. We illustrate the process with several numerical examples.


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Additional Information

DOI: http://dx.doi.org/10.1090/S0025-5718-1978-0472761-3
PII: S 0025-5718(1978)0472761-3
Keywords: Pure cubic fields, fundamental unit, Szekeres algorithm
Article copyright: © Copyright 1978 American Mathematical Society