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A universal first order formula defining the ring of integers in a number field
universal first order formula defining ring integers number field
2012/3/1
We show that the complement of the ring of integers in a number field K is Diophantine. This means the set of ring of integers in K can be written as {t in K | for all x_1, ..., x_N in K, f(t,x_1, ......
DJKM algebras I: Their Universal Central Extension
Krichever-Novikov Algebras Landau-Lifshitz differential equation Date-Jimbo-Miwa-Kashiwara algebras universal central extension
2010/11/30
The purpose of this paper is to explicitly describe in terms of generators and relations the universal central extension of the infinite dimensional Lie algebra, g C[t, t−1, u|u2 = (t2 −...