Math 101 Sets, groups, and topology (Fall 2018): Problem sessions

Main Math 101 page

Problem sessions are times when you can have more practice with the concepts seen in class. They are completely optional, but you are encouraged to attend: this will give you an opportunity to check your understanding and clarify any unclear concepts.

Problem sessions are held on Fridays at 10h30AM or 3PM alternatively, in SC 229. See the announcements on the main page for more.

Problem session of September 21, 2018 (Michele Tienni)

We covered mainly problem 17 in Chapter 10 of Hammack, and along the way we discussed some related topics. Some of the main points were:

• I went over the definition of set complement, especially why we always need a universal set to define it.
• I explained ways in which we can prove an equality of sets by proving both inclusions at once by using "if and only if" statements.
• In the last ten minutes we did a quick induction problem involving a summation (problem 3 in Chapter 10 of Hammack) and went over sigma notation.