Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5772606 | Journal of Number Theory | 2017 | 15 Pages |
Abstract
For two positive definite integral ternary quadratic forms f and g and a positive integer n, if nâ
g is represented by f and nâ
dg=df, then the pair (f,g) is called a representable pair by scaling n. The set of all representable pairs in gen(f)Ãgen(g) is called a genus-correspondence. In [6], Jagy conjectured that if n is square free and the number of spinor genera in the genus of f equals to the number of spinor genera in the genus of g, then such a genus-correspondence respects spinor genus in the sense that for any representable pairs (f,g),(fâ²,gâ²) by scaling n, fâ²âspn(f) if and only if gâ²âspn(g). In this article, we show that by giving a counter example, Jagy's conjecture does not hold. Furthermore, we provide a necessary and sufficient condition for a genus-correspondence to respect spinor genus.
Related Topics
Physical Sciences and Engineering
Mathematics
Algebra and Number Theory
Authors
Jangwon Ju, Byeong-Kweon Oh,