[微積] 極限四則運算乘法證明
弱弱的問一下 如下圖
http://i.imgur.com/AZDhdoU.jpg

為什麼證明到第1式之後,還要在繼續
小於等於第2式才能再繼續後續的證明?
先謝謝各位高手解惑了~
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