Jan 27 and 29

In the notes I'm marking things as 1/27/10, 1/29/10.

Basically, we studied projective modules, talked about long exact sequences on cohomology, defined Exts, and got started on the horseshoe lemma. Also we defined K^0(ring) using projective modules.

Math 7670 begins

January 25: we covered section 1 of the notes.

HW: Exercises 1.1-1.5 from the notes.