Section 3.4 More Set Operators. Exam 2 and Grading Issues Add up all of the points on the exam. Add 15 more points. That is what is in the gradebook.

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Presentation transcript:

Section 3.4 More Set Operators

Exam 2 and Grading Issues Add up all of the points on the exam. Add 15 more points. That is what is in the gradebook. Sample solutions are online. Midterm grades are posted. Please check the spreadsheet for accuracy.

Issue from Exam 2 to remember on the final exam The negation of P  Q is P  ¬Q The definition of odd is any number in the form 2k + 1 for integer k. We haven’t ever officially shown 2k-1

Issue from Exam 2 to remember on the final exam What is the value of: (5 + 2) 2 Notice it is NOT the same as:

First Set Operations Intersection A  B Union A  B

Additional Set Operations Difference A – B B – A Symmetric Difference A  B B  A Complement A on my slides and handouts I will use A c

Activity 1 Write in words how to read each of the following out loud. Then write the shorthand notation for each set. 1.{x  U | x  A and x  B } 2.{x  U | x  A or x  B } 3.{x  U | x  A and x  B } 4.{x  U | x  A}

Activity 2 Let : A = { 1,3,5,7,9} B = { 3,6,9 } U = {x  Z | 0<x<10 } Find the following 1.A  B 2.A  B 3.A  U 4.A  U 5.A – B 6.A c 7.B c

Activity 3 Complete the following sentences without using the symbols , , and -. 1.x  (A  B) if, and only if, … 2.x  (A  B) if, and only if, … 3.x  (A – B ) if, and only if, …

Activity 4 Consider the following sets: U = set of all students at UNI S = set of all students with majors in CHAS C = set of all computer science majors P = set of all physics majors F = set of all women students at UNI What would the Venn diagram for these sets look like?

Activity 5 Write an expression using these sets and the set operations to express the following: 1.The set of people majoring in either computer science or physics. 2.The set of people majoring in both computer science and physics. 3.The set of computer science majors who are women. 4.The set of people who do not have a major in CHAS. 5.The set of male students who are majoring in both computer science and physics. 6.The set of female physics students and male computer science students.