Homework #16
Due Monday, November 14th
Page 479 and following – Exercises
for section 7.1
#1 a {( (0,0), (1,1),
(2,2), (3,3)}
b {(1,3), (2,2), (3,1), (4,0)}
c { (12,0), (2,0), (2,1), (3,0),(3,1), (3,1),
(4,0), (4,1), (4,2), (4,3) }
#2
a {( 1,1), (1,2), (1,3), (1,4), (1,5), (1,6), (2,2), (2.4),
(2.6), (3,3), (3,6), (4,4), (5,5), (6,6)}
b Draw a line from a to b whenever a
divides b
c Put an x in the ith row and jth column if and
only if i divides j.
#3
a Transitive
b Reflexive,
symmetric, transitive
c Symmetric
#24 R-1
= { (b,a) | (a, b) is an element of R} = ( (b,a) | a
< b} = { (a,b) | a > b}
R’ = { (a,b) | (a,b ) is not an element of R} =
{ ( a,b,) | a is not less than b} = { (a,b) | a >= b}
#28
a = { (1,1), (1,2), (2,1), (2,2)
(2,3), (3,1), (3,2), (3,3), (3,4) } = R 2
b = { (1,2), (2,3),
(3,4)} = R1
c = { }
#30 Since (1,2) is an element of R and (2,1) is an element of S, we have (1,1) is an element of S o R
entire answer is { (1,1), (1,2), (2,1), (2,2)}
Page 488 and
following – Excercises for section 7.2
#1
{ (1,2,3), (1,2,4), (1,3,4), (2,3,4)}
#2 (6,1,1,1), (1,6,1,1), (1,1,6,1),
(1,1,1,6), (3,2,1,1), (3,1,2,1), (3,1,1,2), (2,3,1,1), (2,1,3,1), (2,1,1,3),
(1,3,2,1), (1,3,1,2), (1,2,3,1), (1,2,1,3), (1,1,3,2), and (1,1,2,3)
#3 (Nadir, 122, 34, Detroit, 08:10), (Acme,
221, 22, Denver, 08:17), (Acme, 122, 33, Anchorage, 08:22), (Acme, 323, 34,
Honolulu, 08:30), (Nadir, 199, 13, Detroit, 08:47), (Acme, 222, 22 Denver,
09:10), (Nadir, 322, 34, Detroit, 09:44)
#10 The 5-tuples in Table 7 that have A110 as their room
are
(Cruz,
Zoology, 335, A100,
(Cruz,
Zoology, 512, A100,
(Farber,
Psychology, 601, A100,
#15
{P3.5.6}