Lecture 6, 1999/10/12, 8:00-9:50 AM:

We introduced the topology on R^n. Showed it is a metric space,
a normed space and a inner produce space. Showed in abstract the
inclusion of these topological spaces.

Introduced the notion of open set (using R^n as a metric space only),
some basic properties (finite intersection and arbitrary union).
defined the interior of a set and showed it is an open set.