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It has recently been established that there are exactly seven Witt equivalence classes of quadratic number fields, and then all quadratic and cubic number fields have been classified with respect to ...
URI ANDREWS, ANDREA SORBI, THE COMPLEXITY OF INDEX SETS OF CLASSES OF COMPUTABLY ENUMERABLE EQUIVALENCE RELATIONS, The Journal of Symbolic Logic, Vol. 81, No. 4 (DECEMBER 2016), pp. 1375-1395 ...
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