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内容説明 An introduction to the basic tools of the theory of (partially) ordered sets such as visualization via diagrams， subsets， homomorphisms， important order-theoretical constructions and classes of ordered sets. Using a thematic approach， the author presents open or recently solved problems to motivate the development of constructions and investigations for new classes of ordered sets. The text can be used as a focused follow-up or companion to a first proof (set theory and relations) or graph theory course.