Solutions to Homework #9, Problems 23-29
Problem 20. Give proofs of the following. 1. A ( (B ( A) is a logical truth. The way we prove that something is a logical truth is by proving it with no premises. Thus, we need to start out by making assumptions. Let’s assume A. If we can somehow prove B ( A by assuming A, we will have shown that A ( (B ( A). Now, how can we prove B ( A? ................
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