The following calendar will be populated with links to worksheets, videos, activities and daily posts, so you can catch up on anything you’ve missed and revisit important material.

**Monday, August 24th:**- What we did in class: Polyhedron exploration activity. The materials: Exploratory activity and polyhedron pictures. Here are the pictures with vertices, edges, faces counted: first page, second page. Here are the slides from class.
- Here’s an excellent 3blue1brown video a student pointed me to, giving a proof of Euler’s formula V-E+F=2. We will get to some of these ideas later in the course; for now, just enjoy!

- After-class daily post link: Due Wed Aug 26

**Wednesday, August 26th:**- What we did in class: We began discussing sets. We covered the definition of set, element, equality, cardinality and subsets, as well as some standard sets of numbers and the empty set. We did lots of examples.
- In-class notes

- After-class daily post link: Due Fri Aug 28

**Friday, August 28th:**- What we did in class: We did a practice Worksheet on elements and subsets. The correct answers to the first part spell an english message when read backward from bottom to top. We took these up (whiteboard notes). Then we briefly talked about active reading.
- After-class daily post link: Due Mon Aug 31

**Monday, August 31st:**- What we did in class: We shared active reading strategies, we talked about what is a proof, and then we considered the sandbox problem. As a group we decided on the answer, and then we broke into groups to try to write up proofs.
- After-class daily post link: Due Wed Sept 2

**Wednesday, September 2nd:**- What we did in class: We discussed some first examples of proofs based on the sandbox problem (pdf notes). Then we introduced two types of set-builder notation (link to notes).
- After class daily post link: Due Friday Sept 4

**Friday, September 4th:**- What we did in class: We did an activity to practice dealing with set builder notation.
- Here are some brief whiteboard notes.
- Set Builder Activity: Caller Cards and Bingo Sheet.
- After class daily post link: Due Wed Sept 9

**Wednesday, September 9th:**- What we did in class: We finished up with some lecture about set builder notation in the contexts of the real line (interval notation), the Cartesian plane (where you draw graphs for example), and the universe of subsets of some set. Then we began discussing a proof of the fact that if n is odd, then n^2 is odd. We only got as far as deciding on our definitions. Here are class notes.
- After class daily post link: Due Fri Sept 11

**Friday, September 11th:**- What we did in class: We finished up about the n^2 odd proof. Then we introduced and discussed Cartesian products. Here are notes.
- After class daily post link: Due Mon Sept 14th

**Monday, September 14th:**- What we did in class: We continued Cartesian products, talking about the Multiplication Principle, and we also discussed Power Sets and proved a formula for the cardinality of a Power Set. Here are notes.
- After class daily post link: Due Wed Sept 16

**Wednesday, September 16th:**- What we did today: We discussed more examples of proofs. Here are notes.
- After class daily post link: Due Fri Sept 18

**Friday, September 18th:**- What we did in class: TBA
- A first worksheet on counting
- After class daily post link: TBA