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Unformatted text preview: X is a subset of A £ B , then X need not be of the form C £ D where C is a subset of A and D is a subset of B . 3. How many functions are there from a set X with 5 elements to a set Y with 7 elements? How many of these functions are injective? 4. Determine if each of the following statements is true or false. (a) 40 · 13 mod 9 (b) ¡ 29 · 1 mod 7 (c) ¡ 29 · 6 mod 7 (d) 132 · 0 mod 11 5. Exercise 10, Page 10 from NagpaulJain. 6. Exercise 11, Page 10 from NagpaulJain. Add to this exercise: Write the equivalence class of (5 ; 3). Math 4023 1...
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This document was uploaded on 12/28/2011.
 Fall '09

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