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Darrin Doud
| 314 TMCB Department of Mathematics Brigham Young University Provo, UT 84602 |
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Local corrections of discriminant bounds and small degree extensions of quadratic base fields
with Sharon Brueggeman
International Journal of Number Theory, 4(2008), 349-361.
Abstract: Using analytic techniques of Odlyzko and Poitou, we create tables of lower bounds for discriminants of number fields, including local corrections for ideals of known norm. Comparing the lower bounds found in these tables with upper bounds on discriminants of number fields obtained from calculations involving differents, we prove the nonexistence of a number of small degree extensions of quadratic fields having limited ramification. We note that several of our results require the locally corrected bounds.
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Supplementary Tables and Computer Code
In addition to a preprint of our paper, we also make available further tables of discriminant bounds involving local corrections as well as the Maple code used to construct the tables. These tables consist of unconditional lower bounds for discriminants of number fields of a given degree, with r1 real places and primes of certain norms. For details about the tables and their construction see the paper. We plan to include more bounds derived under the assumption of the GRH in the near future.Maple Code for unconditional case
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