Addenda A
Some Concepts and Properties of Point Set Topology
A.1. Relation and Mapping
A.1.1. Relation
Definition 1.1.1
and 
are any two sets. 
is called a Cartesian product of X and Y, denoted by 
, where 
is a pair of ordered elements. x is the first ...Get Quotient Space Based Problem Solving now with the O’Reilly learning platform.
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