About CHIBA N
About Tohoku Univ.
About NISHIZEKI T
About Tohoku Univ.
About SAITO N
About Tohoku Univ.
About SIAM Journal on Computing (Society for Industrial and Applied Mathematics)
About graph theory
About NP完全
About Theory of computation
About 平面グラフ
About 集合
About 問題
About 近似アルゴリズム