About Sakai Keiichi
About Faculty of Mathematics, Shinshu University, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
About Sugiyama Ryutaro
About Faculty of Mathematics, Shinshu University, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
About Topology and its Applications
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About invariant
About 平面曲線
About Generic closed plane curves
About The Arnold invariants
About Generalized connected sums
About Graphic and image processing in general
About Code theory
About Topology
About 平面曲線
About 不変量
About 一般化