Homework on §1.2--assigned Mon 8/28 and due Wed 8/30

(i) Give your own example of four non-equivalent sentences that make up a square of opposition (i.e., two mutually exclusive sentences each of implies one of a pair of jointly exhaustive sentences and is contradictory to the other), and (ii) pick one pair of sentences and briefly describe the sort of possible world which shows that they are not equivalent (i.e., describe a possible world in which they have different truth values).