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Homework Help: Discontinus limits

  1. Sep 22, 2009 #1
    On the graph, the limit at a has a removable discontinuity at b. And below this, there is a darkened circle, which means that f(b) exists. Does this mean that f is discontinuous at x=b?
  2. jcsd
  3. Sep 22, 2009 #2
    Use the fact that if a function is continuous at a, then any sequence x_n that converges to a will satisfy lim f(x_n) = f(a) as n tends to infinite. So if you can find two such paths that tend to different limits you will have shown that the function is discontinuous at that point
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