[集合論] 關於cardinality

[jimlucky (......)]

S is the sets of all finite subsets of R.
Find cardinality of S ?


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◆ From: 140.109.105.3
推 chy1010     : c = #R < #{all n elements subset} < R^n = c
→ chy1010     : {all finite subset} = union_n {n element subset}