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- #1

- Apr 13, 2013

- 3,828

I am given the following exercise:

Find

**max,min,sup,inf**of the set:

$$B=\{\frac{(-1)^{n}m}{n+m},n,m=1,2,....\}$$

I thought the following:

$$supB=\frac{1}{3},maxB=\frac{1}{3},infB=0, \nexists minB$$

Are the above right?? If yes,how can I prove that it is actually like that??