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## Main Question or Discussion Point

So we just recently did accumulation points in my maths class for chemists. I understood everything that was taught but ever since I was trying to find a reasonable explanation if the

**sequence a**has 2 accumulation points (-1,1) or if it doesnt have any at all. I mean it's clear that its divergent (?), but that doesnt solve the problem. Because the Set of values for the sequence would be just {1,-1}, no values in between. So the general definition of accumulation points doesnt quite fit, or does it? Can somebody explain it maybe in words and in a mathematical way? Thx_{n}= (-1)^{n}