Logic Lecture 4

In class this evening we finished up chapter 5 in the first half and started syllogisms in the second half. So for today the first quiz question is if the A statement "All cowboy hats are smaller than Mexican Sombreros" is true, what would be the truth value of the three other statements on the Traditional Square of Opposition? The second quiz question is, is the syllogism OOO-4 valid or invalid?