Mathematics – Number Theory
Scientific paper
2010-02-02
Funct. Approx. Comment. Math. Volume 46, Number 1 (2012), 117-131
Mathematics
Number Theory
16 pages, 1 table
Scientific paper
10.7169/facm/2012.46.1.9
In this paper we consider genus one equations of degree n, namely a (generalised) binary quartic when n = 2, a ternary cubic when n = 3, and a pair of quaternary quadrics when n = 4. A new definition for the minimality of genus one equations of degree n is introduced. The advantage of this definition is that it does not depend on invariant theory of genus one curves. We prove that this definition coincides with the classical definition of minimality when n <= 4. As an application, we give a new proof for the existence of global minimal genus one equations over number fields of class number 1.
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