Lecture 8, 1999/10/19, 8:00-9:50 AM:

alternative definition for bd(A), U open containing x, U contains
points in A and A^c.

next introdece the notion of converging sequence in R^n.

Characterized closed sets and cl(A) using congerging sequences.
Introuced limit points of a in the proof.

defined convergence of series in R^n

reviewed several testds for converging/diverging series in R,
including integral test, p series, ratio and root test in weak form.