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The homework questions are proofs intro. Each of these derivations (proofs) are demonstrations of VALIDITY. Specifically, they are demonstrations that the goal sentence (the conclusion) validly follows from the starting assumptions (premises). 1) Write the goal sentence. 2) Determine the main logical operator of sentence to determine what kind of sentence it is – an atomic sentence, a conjunction, a disjunction, etc. 3) Figure out what you need to do to get the goal sentence. For instance: a. If the sentence is a conjunction, you must get each conjunct on a separate line of the derivation. b. Each conjunct must be derived by locating where it appears in the starting assumptions (SA)/premises, and then applying the appropriate Introduction and Elimination rules to get that conjunct. 4) No two different proofs will be exactly the same. The only way to get good at proofs is to practice, practice, practice.