week 1 and week2

There are several things I have learned this week in class. Firstly, I learned that it is difficult to find the universial/existential quantifer. What I learned is that in order to falsify a universal claim, you only need to find one counter-example, but to falsify an existential claim, you need to show that there are absolutely no examples. Similarly, to justify a universal claim, you need to show that there are no counter-examples, while to justify an existential claim, you need to show that there is at least one example. Also using the venn diagrams, it became much easier and more interesting to learn. This made me more confident in terms of thinking logically.