暈倒

函數在一點連續同函數在這點有極限的差別就只有"一點" :
函數在這點有極限是與函數在這點的函數值無關的(函數甚至可以在這點沒有定義),
而函數在這點連續,則函數必須在這點有定義,且函數的極限值就等於函數值。
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