Norifumi Ojiro

collaborators

3 papers

math.AG2018

Rational curves on a smooth Hermitian surface

Norifumi Ojiro

We study the set $R$ of nonplanar rational curves of degree $d < q + 2$ on a smooth Hermitian surface $X$ of degree $q + 1$ defined over an algebraically closed field of characteristic $…

math.NT2018

A $40$ -dimensional extremal Type II lattice with no $4$ -frames

Norifumi Ojiro

We construct a $40$ -dimensional extremal Type II lattice not having any subsets consisting of $40$ orthogonal minimal vectors, and determine the automorphism group. This lattice gi…

math.NT2016

The trace of modular forms and its application to number theory

Norifumi Ojiro

We provide a generalization of an algebraic linear combination for the trace of certain elliptic modular forms, and through specializing the expression at a suitable pair consistin…

Rational curves on a smooth Hermitian surface

A 40-dimensional extremal Type II lattice with no 4-frames

The trace of modular forms and its application to number theory

A $40$ -dimensional extremal Type II lattice with no $4$ -frames