1/(1-0.999...) -> infinity
1/(1-1) = undefined
0.9999...係converge to 1,唔係等於1,
Tends to infinity係指一個Sequence既行為
而你第2行係講緊2個Number Equal
唔同Concept黎
廢話連篇
我話兩樣野唔一樣,當然係兩個concept
如果你明呢樣野,你唔會寫1/(1-0.999...) -> infinity
而係會寫 1/(1-a_n) -> infinity
where a_1=0.9, a_2=0.99, a_3=0.999, a_4...
0.999...係講緊個sequence既limit point, 即係已經take 左limit
你咁講,姐係0.999...唔可以獨立於個sequence存在
0.999...呢個符號既定義係由Sequence出發,從而得出既limit,但唔係sequence
所以根本冇所謂"0.9999...係converge to 1"
數字係唔會converge to 數字,sequence 先會
我當我跟你個玩法
lim 1/(1-a_n) =infinity
where n tends to infinity
1/(1-1) =undefined
Okay?