Dawoon Jung
HW #5
Lab #11
Section 2.1
10. (a) True, because is an element of set cfw_
(b) True, because is an element of set cfw_,cfw_
(c) False, because cfw_ is not an element of set cfw_
(d) True, because cfw_ is an element of set cfw_
(e) True, because

Dawoon Jung
HW #3
Lab #11
Section 1.6
16. (a) E(x) = enrolled in the university, D(x) = lived in a dormitory
Everyone enrolled in the university has lived in a dormitory = x(E(x) D(x)
Mia has never lived in a dormitory = D(Mia)
Therefore, Mia is not enrol

Dawoon Jung
HW #4
Lab #11
Section 1.7: 10, 16, 24
10. The multiply of 2 rational number is also rational because suppose r,s Q, r=(a/b),
s=(c/d), Notice that, r*s = (a/b)*(c/d) = (ac/bd), (a,b,c,d Z), (b0),(d0). Since, (ac Z),
(bd Z) and bd 0 by closure p

Dawoon Jung
HW #1
Lab #11
Excersice 1.1
12. (a) if you have the flu, then you miss the final examination
(b) You dont miss the final examination if and only if you pass the course. ?
(c) if you miss the final examination, then you dont pass the course.
(d

Dawoon Jung
HW #2
Lab #11
Exercise 1.4
6. (a) Some of students in your school have visited North Dakota
(b) Every students in your school has visited North Dakota
(c) None of students in your school have visited North Dakota
(d) Some students in your scho