This week I covered Sections ¡­

This week I covered Sections 4.2, 4.3, and parts of 4.4 (finished the proof of the deformation invariance theorem).

Exercises for week 42:

Section 4.2: 5, 6, 7, 11,13, 18

Section 4.3: 2, 5, 7, 11

Section 4.4: 1, 2, 3, 9