# am_lect_02 - Announcements Look out for HW 1 on the web...

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Announcements Look out for HW 1 on the web page later today http://www.cs.uiuc.edu/class/sp10/cs173 Weights for exams, homeworks, etc. have been posted

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Sets (Informal) A collection of unique items (no repeats allowed) Notation : Use capital letters for sets, lower-case letters for set members x A means x is a member of set A x A means x is not a member of set A Examples : Z = { …, 3, 2, 1, 0, 1, 2, 3, … } all integers Z + = { 1, 2, 3, … } positive integers N = { 0, 1, 2, 3, … } natural numbers (includes 0) Q rational numbers of the form p / q where p Z and q Z and q 0 R real numbers rationals, plus irrationals like π and 2 C complex numbers of the form ( a + bi ) where a , b R , and i = √ − 1
More set notation Often, we will be dealing with N or Z , so make sure that you “stay within the set” Example : If p , q N then p / q may not be a natural number Related point: Don’t use calculus on problems that don’t require it

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## This note was uploaded on 12/24/2010 for the course CS CS 173 taught by Professor Fleck during the Spring '10 term at University of Illinois, Urbana Champaign.

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am_lect_02 - Announcements Look out for HW 1 on the web...

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