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A problem about the geometric explanation of the limit of sequence in P26 1-24, the first volume of advanced mathematics (Tongji 6th edition).
This is to cater to n> When n, all points Xm fall within α-ε.
Let me give you an example: {an} = (-1) n× (1/2) na1=-1/2a2 =1/4a3 =-1/8.
Ask again if you don't understand. I wish you progress in your study and go up a storey still higher! (*^__^*)