Doug EnsleyProfessor of Mathematics

Discrete Math 
On page 50, in the solution to Practice Problem 7b the negation is given correctly but it is the original statement, not the negation, that is the true statement.
In Problem 21 of Section 2.6, the second card shown
should have a "19" in place of one of the two "3"s that errantly appear
on that card.
For Problem #3(d) in Section 3.3, the "equality"
symbol should be replaced with the "subset" symbol to create a true
statement that can be proved.
On page 271, in Figure 426, g is not a function (3 relates to both 2 and 4). The arrow 3>4 should be 4>3.
For Problem #21 in Section 6.2, the answers in the back of the book and in the Student Solution Manual are incorrect. The correct answer for part (a) is 4^3/C(50,3), and the correct answer for part (c) is 4^4/C(50,3)
On page 519, the assumption of "simple" in the hypothesis is not needed. Proposition 2 and 3 characterize all connected graphs, not just the simple ones.
For more details, contact me by sending email to deensley@ship.edu or by using the information at the right. 
Doug
Ensley Department of Mathematics Shippensburg University Shippensburg, PA 17257 Phone: (717) 4771477 Fax: (717) 4774009 