## Highlights of Calculus

**Highlights of Calculus (Res.18-005, MIT OCW)**. Instructor: Professor Gilbert Strang. Highlights of Calculus is a series of short videos that introduces
the basics of calculus - how it works and why it is important. The intended audience is high school students, college students, or anyone who might need help
understanding the subject. The series is divided into three sections: 1) Introduction - Why Professor Gilbert Strang created these videos, 2) Highlights of
Calculus - Five videos reviewing the key topics and ideas of calculus, Applications to real-life situations and problems, and 3) Derivatives - Twelve videos focused on
differential calculus, More applications to real-life situations and problems. (from **ocw.mit.edu**)

Lecture 09 - Limits and Continuous Functions |

For calculus the important case where you CAN'T TELL by just knowing A and B is A/B = 0/0. If f(x) and g(x) both get small ( f/g looks like 0/0 ), then l'Hopital looks at slopes: f/g goes like f '/g'. When is f(x) continuous at x=a ? This means: f(x) is close to f(a) when x is close to a.

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