Some old notes

The notes below are likely full of typos.

Lecture notes for seminars given at CMU aimed at a general graduate student audience on the subjects of forcing, large cardinals and trees.

Four talks given at CMU on Mitchell's forcing to get the tree property at $\aleph_2$. Talk 1, Talk 2, Talk 3, Talk 4.

Three talks given at CMU on PCF theory Talk 1, Talk 2, Talk 3.