Khan Academy Static

Review_Limits_basics

Review your understanding of the basics of limits with some challenge problems.

Limits_introduction

A limit is the value that a function or sequence "approaches" as the input or index approaches some value. In this tutorial, we supply an intuitive understanding of limits.

One_sided_limits

Learn one-sided and two-sided limits. Investigate the relationship between a two-sided limit at a point and the one-sided limits at that point (spoiler: the two-sided limits exists if and only if the one-sided limits exist and are equal).

Formal_definition_of_limits_epsilon_delta_

Now that you have an intuitive understanding of limits, let's do what mathematicians do best and define them rigorously! This definition may be hard to grasp at first, but its beauty will get you in the end.