### 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.