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dm-lec9-relations - For the past two weeks Finished Chapter...

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For the past two weeks… Finished Chapter 1: Sets and Logic Learn Chapter 2: Proof Started Chapter 3: Functions and Sequences Questions? direct to Prof.Song: [email protected] Homework #1 graded Average= 84.5 (Max= 100 , Min= 51 ) H k #2 t & d d Homework #2 out & graded Average= 81.4 (Max= 97 김동현, 윤철희, 정진수 Min= 34 ) Unresolved cases Solutions for some problems are posted TA will be available for the questions after class today Homework #3 out (due today!) LATE HOMEWORK penalty will be applied [email protected] CS204 Discrete Math (Fall 2009) 1 F ti S Functions, Sequences, & Relations Chapter 3 Chapter 3 (3.3 Relations) S t b 21 2009 September 21, 2009 Function Let X and Y be sets f X Y f: X Y Domain (X) , Codomain (Y) Range ( ) f = { (1,a), (2,b), (3,a) } Range ( One-to-one (injective) function Onto (surjective) function Bijection [email protected] CS204 Discrete Math (Fall 2009) 4 Relations A (binary) relation R from a set X to a set Y is a subset of the Cartesian product X x Y.

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