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# Question.

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can someone please explain what "lim" means? and that weird E thing next to the latex? cuz i always see these and i dont know what they are.

Jun 27, 2019

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"lim" is short for limit.  It means take the limit, so, for example  $$\lim_{x\rightarrow 0}(x^2-3)$$ means take the limit of the expression x2 - 3 as x goes to zero.

The "weird E thing" is the summation sign (it's the Greek upper case letter sigma), so for example $$\sum_{k=1}^3x_k$$ is the same thing as x1 + x2 + x3.

Jun 27, 2019
edited by Alan  Jun 27, 2019