About Takahasi Sin-Ei
About Laboratory of Mathematics and Games, Funabashi, Japan
About Miura Takeshi
About Department of Mathematics, Faculty of Science, Niigata University, Niigata, Japan
About Oka Hirokazu
About Faculty of Engineering, Ibaraki University, Hitachi, Japan
About Semigroup Forum
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About real number
About isomorphic mapping
About topology
About characterization
About operation(mathematics)
About semigroup
About Cancellative continuous semigroup operation
About Distribution law
About Homeomorphic isomorphism
About Theory of computation
About Mathematical physics
About 実数
About 半群
About 特性化