3 papers
math.AG2026
Curves on irrational ruled surfaces whose complements are of non-general type
Hideo Kojima
Let be a curve on an irrational ruled surface . We prove that the logarithmic Kodaira dimension of equals the Iitaka dimension of and give a rough configuratio…
math.AG2019
Smooth factorial affine surfaces of logarithmic Kodaira dimension zero with trivial units
Gene Freudenburg, Hideo Kojima, Takanori Nagamine
This paper considers the family of smooth affine factorial surfaces of logarithmic Kodaira dimension 0 with trivial units over an algebraically closed field . Ou…
math.AG2018
Closed polynomials and their applications for computations of kernels of monomial derivations
Chiaki Kitazawa, Hideo Kojima, Takanrori Nagamine
In this paper, we give some results on closed polynomials and factorially closed polynomial in variables. In particular, we give a characterization of factorially closed polyno…