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Quotient Space Based Problem Solving by Bo Zhang, Ling Zhang

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Addenda A

Some Concepts and Properties of Point Set Topology

A.1. Relation and Mapping

A.1.1. Relation

Definition 1.1.1

image and image are any two sets. image is called a Cartesian product of X and Y, denoted by image, where image is a pair of ordered elements. x is the first ...

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