Abstract
We shall show a relation between Gauss' ternary quadratic form and an ideal of a quadratic field. Using this relation, we can compute rapidly the 2-part of ideal class group of a quadratic field in narrow sense and in wide sense.
Citation
Julius M. Basilla. Hideo Wada. "On efficient computation of the 2-parts of ideal class groups of quadratic fields." Proc. Japan Acad. Ser. A Math. Sci. 80 (10) 191 - 193, Dec. 2004. https://doi.org/10.3792/pjaa.80.191
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