Solutions to Homework #9, Problems 23-29
Well, we can start out by assuming B. If we can conclude A (which we can, because we have already assumed it) by assuming B, then we have shown B ( A. Since we have now got B ( A by assuming A, we have shown that A ( (B ( A) and since we have proven this by starting with no premises, we have shown that it is a logical truth. 2. ................
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