209 citations · 1.6k across the 96 of their papers we have counts for
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The algebro-geometric aspect of the iterated limit of a quaternary of means of four terms
Keiji Matsumoto, Ryunosuke Nakano
We study the iterated limit of a quaternary of means of four terms through the period map from the family of cyclic fourfold coverings of the complex projective line branching at s…
Schwarz's map for Appell's second hypergeometric system with quarter integer parameters
Keiji Matsumoto, Shohei Osafune, Tomohide Terasoma
We study Schwarz's map for Appell's second system $\cF_2$ of hypergeometric differential equations in two variables with parameters , .…
Relative twisted homology and cohomology groups associated with Lauricella's
Keiji Matsumoto
We introduce relative twisted homology and cohomology groups associated with Euler type integrals of solutions to Lauricella's system of hypergeometric differential eq…
Period map of triple coverings of and mixed Hodge structures
Keiji Matsumoto, Tomohide Terasoma
We study a period map for triple coverings of branching along special configurations of lines. Though the moduli space of special configurations isa two dimensiona…
Irreducibility of the monodromy representation of Lauricella's
Yoshiaki Goto, Keiji Matsumoto
Let be the hypergeometric system of differential equations satisfied by Lauricella's hypergeometric series of variables. We show that the monodromy representation o…
A system of hypergeometric differential equations in two variables of rank 9
Jyoichi Kaneko, Keiji Matsumoto, Katsuyoshi Ohara
We study a hypergeometric function in two variables and a system of hypergeometric differential equations associated with this function. This is a regular holonomic system of rank…