hw10 - What does the following Venn diagram seem to say...

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Intro to Abstract Math Homework 10 Fall 2009 Due September 28 Exercise 28. Let A = { n 2 + n + 1 | n N } and B = { 2 n + 1 | n N } . Prove that A B . Exercise 29. Are the sets { n 3 + n | n N } and { n 2 - 2 n - 1 | n N } disjoint? Be sure to justify your answer. Exercise 30.
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Unformatted text preview: What does the following Venn diagram seem to say about ( A C )-B ? Is this statement always true? Either prove it or nd a counterexample....
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