What Is X Down & Up Arrows a (Limit from Left/Right)?

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X downward arrow a (is it limit from left)
X upward arrow a (is it limit from right)
?
 

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woundedtiger4 said:
X downward arrow a (is it limit from left)
X upward arrow a (is it limit from right)
?

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
 
fzero said:
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

Thanks
 

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