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If the weight is countable, we call | If the weight is finite or countable, we call the space a [[second-countable space]]. | ||
Latest revision as of 04:20, 27 January 2012
Template:Topospace cardinal function
Definition
The weight of a topological space is the minimum possible cardinality of a basis for the topological space (if finite, we take the weight as countable).
Particular cases
If the weight is finite or countable, we call the space a second-countable space.