1999/09/17, 8:00-9:50 AM:
We introduced the notion of completion.
 (1) proved sqrt(2) is nor rational.
 (2) gave a sequence in Q that converge to sqrt(2)

 motivating to complete Q so that all the Cahchy seq converge.

We then introduced equivalence relation and showed to define quotion
space. (made a misteke on def of equiv)