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What is this symbol?

  1. Nov 6, 2013 #1
    X downward arrow a (is it limit from left)
    X upward arrow a (is it limit from right)

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  2. jcsd
  3. Nov 6, 2013 #2


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    It's the other way around. Up arrow means increasing value of ##x##, so limit from the left. It's not a common notation, but it is mentioned on wikipedia: http://en.wikipedia.org/wiki/One-sided_limit
  4. Nov 6, 2013 #3
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