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A superscript plus or minus on the limit point, approaching from one side only.
Also known as: Left-hand limit, Right-hand limit, Limit from above, Limit from below
The small plus or minus after the value being approached says which side the approach comes from, and the two can differ. Where they do, the two-sided limit does not exist — so the superscript is not a refinement of the notation but the thing that decides whether the limit is defined at all.
Denotes a limit approached from above (superscript plus) or from below (superscript minus).
Contexts: Mathematics
Is what a two-sided limit is defined in terms of: the ordinary limit exists exactly when both one-sided limits exist and agree.
Contexts: Mathematics
The word lim with a variable, an arrow and a value beneath it, the value carrying a small raised plus or minus sign.