For the hardback edition of Discrete Mathematics, 6e, the errata list can be reached from this link. The following corrections are for the paperback Discrete Source.
Page 36: Line 7 from the top, "x not in B" should be "x not in A".
Page 68: In Exercise 28, Section 1, 54 should be 64.
Page 68: The solution to Exercise 82 should read: The set of primes.
Page 69: The solution to Exercise 41 should be 6.
Page 84: In the line following equation (2.1), "c,d in R" should be "c,d in X".
Page 92: The first row of the matrix at the bottom of the page should be "1 1 2 0".
Page 115: In the lower-left box in the table at the bottom of the page, the third entry in the left column should be "X sub 3" (not X sub 2).
Page 135: In the first line of Example 8.4, "80" should be "89".
Page 152: Delete the two gammas in Figure 1.6.
Page 155: In the 5th line of Exercise 59, "follow" should be "following".
Page 167: In the 6th line following equation (2.22), delete the first word ("if").
Page 169: In column 1, in the 4th line following
the displayed equation
D sub 3 = 2 = 2(1+0) ...
the first "n-1" should be "n".
Page 221: In Figure 4.3, the infinity near vertex f should be deleted.
Page 233: In Figure 6.4, the gamma near vertex j in graph G sub 2 should be deleted.
Page 253: In Exercise 50, all ":=" should be "=".
Page 258: In Exercise 15 of Section 8, there is an extraneous dot above the right portion of the graph.
Page 265: In Figure 1.10, the "1" nearest "A" should be deleted.
Page 267: Section Review Exercise 4 should be: What is the height of a rooted tree?
Page 267: In Exercise 3, the middle dot should be omitted.
Page 270: In the 10th line of the proof, "P is contains" should be "P contains".
Page 291: In the 6th line from the bottom, "of tree" should be "of a tree".
Page 333: In the text at the bottom of the figure
for Exercise 19, all of the minus signs
and equals signs are missing. The text
should read:
3 - 1 = 2 4 - 1 = 3 etc.
Page 357: In the next-to-last line of Example 7, "element the" should be "element in the".
Page 360: In Exercise 1, line 3, "2" should be "3".