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Rintaro Kozuma

Publications and source records attributed to Rintaro Kozuma.

2 recordsLinked to original sources

An explicit expression of the Lerch zeta function on maximal domains of holomorphy

We give two results on the Lerch zeta function $Φ(z,\,s,\,w)$. The first is to give an explicit expression providing both the analytic continuation of $Φ$ in $n$-variables $(n \in \{1,\,2,\,3\})$ to maximal domains of holomorphy in $\mathbb{C}^n$ with computable evaluation and an extended formula for the special values of $Φ$ at non-positive integers in the variable $s$. The second is to show that Lerch's functional equation is essentially the same as Apostol's functional equation using the first result.

math.CV

Elliptic curves related to cyclic cubic extensions

The aim of this paper is to study certain family of elliptic curves $\{\mathscr{X}_H\}_H$ defined over a number field $F$ arising from hyperplane sections of some cubic surface $\mathscr{X}/F$ associated to a cyclic cubic extension $K/F$. We show that each $\mathscr{X}_H$ admits a 3-isogeny $ϕ$ over $F$ and the dual Selmer group $S^{(\hatϕ)}(\hat{\mathscr{X}_H}/F)$ is bounded by a kind of unit/class groups attached to $K/F$. This is proven via certain rational function on the elliptic curve $\mathscr{X}_H$ with nice property. We also prove that the Shafarevich-Tate group $\text{\cyr X} (\hat{\mathscr{X}_H}/\rat)[\hatϕ]$ coincides with a class group of $K$ as a special case.

math.NT