In the second week of CSC 165 we mainly learned how to falsify or confirm claims about sets. I feel like the venn diagrams that we used to help us with proving or disproving claims about sets were a great help because they allowed me to visualise what a question is asking. We also learned how to use the mathematical notation to make claims about sets. Later this week, during the quiz in the tutorial I applied something I've learned in the first week. The question was asking how to represent the following situation on a venn diagram: "a person says that all the students at UofT who have a computer science class also have a linguistics class". Obviously, the question is asking to draw a set that is a subset of another. The problem that I encountered was that i wasn't sure if I just had to draw an X in the part of the set of the computer science students outside of the set of linguistics students or also an O inside the other part of the set. However, I was able to solve this problem after I remembered the rule "an empty set is a subset of all sets" from the first class. So it didn't matter if there were any people in the computer science set at all, it would still be a subset of the linguistics set.
