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hw6b - statement of Problem 7 A c ⊂ B if and only if A...

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Introduction to Mathematical Reasoning Fall 2009 Assignment #6: Due Wednesday, 11/18/09 Part II: 4. Eccles, page 73, Exercises 6.5, 6.6, 6.7. 5. Prove Theorem 6.3.4(iv) (De Morgan’s Laws). 6. Eccles, page 115–116, Problems 3, 4, 6, 7*. *When Eccles says “by taking complements,” he is suggesting a way to prove the second
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Unformatted text preview: statement of Problem 7 ( A c ⊂ B if and only if A ∪ B = U ) by using the Frst statement, together with the properties of Theorem 6.3.4. This should make the proof of the second statement easier than that of the Frst....
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