Exercises from Hatcher:
4.1 #4, #10, #18
4.2 #1, #2, #7, #28, #31, #32
4.3 #3, #4, #5
Dan CG's website
Academic webpage for Dan Cristofaro-Gardiner
Exercises from Hatcher:
4.1 #4, #10, #18
4.2 #1, #2, #7, #28, #31, #32
4.3 #3, #4, #5