Kaomojis
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#topology
#topological space
#subset
#open set
#part of a whole
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#topology
#open set
#topological structure
#mathematics
#set theory
#definition
#tau
#point-set topology
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#constructible set
#algebraic geometry
#locally closed set
#open set
#closed set
#set intersection
#topology #topological space #subset #open set #part of a whole