[集合論] 關於cardinality

看板Math作者 (......)時間13年前 (2012/11/09 20:05), 編輯推噓1(101)
留言2則, 1人參與, 最新討論串1/1
S is the sets of all finite subsets of R. Find cardinality of S ? -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.109.105.3

11/09 20:20, , 1F
c = #R < #{all n elements subset} < R^n = c
11/09 20:20, 1F

11/09 20:21, , 2F
{all finite subset} = union_n {n element subset}
11/09 20:21, 2F
文章代碼(AID): #1GdF6Bt_ (Math)