Symbolize the following, construct a truth table, and then determine if the argument is valid or invalid.
1) If Simpson appeals, then he can postpone payment only if he posts a bond of $12.75 million. He cannot post such a bond. If he doesn't appeal, he cannot postpone payment. It follows that he cannot postpone payment. [this argument is from an article in the Miami Herald after O.J. Simpson's civil trial.]
2) If Newton's analysis of motion is correct, then Galileo is correct provided that Aristotle is wrong. If Galileo is incorrect then Newton is incorrect. Therefore either Aristotle is correct or Galileo is wrong.