Class Info

  • Date: Thursday, 10/21/21, 4:05 – 5:45pm
  • Meeting Info: The class will meet live on zoom today.

To-Do Before Class

  • Don’t forget to bring your conjecture (created as part of the OpenLab assignment Lockhart’s Lament) to class today.


  1. Chapter 5: Contrapositive Proof


  • Use the method to contrapositive proof to prove conditional statements.


Zoom recording

Class notes

A group activity will take place during class.

To-Do After Class

Complete the homework assignment from Chapter 5 (due next Tuesday).

Homework due Tuesday 11/2/21: Chapter 5: 1, 4, 9
(Upload link)

Submitting written work (instructions)

  • Take a picture of each written page of your assignment, and combine the pictures into a single pdf document. How to create a pdf (includes instructions for iOS (iPhone), Android, Mac and Windows)
  • Give the document a name that will help me identify it, for example: “JRodriguez-Class1Homework.pdf”
  • Use this upload link to upload your pdf (this link connects to a Dropbox folder, but you do NOT need to have a Dropbox account to use it).
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