Kaomojis
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#sigma-compact
#mathematical notation
#countable union symbol
#compact set
#union notation
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#sigma-compact
#countable cover
#compact sets
#topological space
#union of compacts
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#sigma-compact
#countable union
#compact subsets
#topological space
#lindelöf space
#building space
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#sigma-compact
#countable steps
#exhaustion by compact sets
#mathematical analysis
#sigma-compact #mathematical notation #countable union symbol #compact set #union notation