Determine all the accumulation point.

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The discussion centers on determining the accumulation points of the sequence defined by the formula (-1)^(n+1)/m, where n and m are positive integers. It is established that the terms of the sequence approach 0 as m increases, while the sequence alternates between -1 and 1 for varying n. Consequently, the accumulation points of this sequence are definitively identified as -1, 0, and 1.

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furi0n
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I've faced with some problem in Math. Analysis books of Tom Apostol,
For example, (-1)n+ 1/m, n,m=1,2,3,4,5...

i think there is no accumulation point but how should i prove this?

thanks for your helps...
 
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Since the 1/m term -> 0, -1 and 1 are accumulation points.
 

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