## ERRATA

We shall list any errors located in the text on this page.

- pg. 21, line 7 : (r-k)(r-1)(k-1) >= 0 is the
correction. [Phil DeOrsey spotted this one.]
- pg. 57, line 20: the orbit (5 10 20 19 17 3) should be (5 10 20 19 17 13). [Jenny Diemunsch
spotted this.]
- pg. 74, line -6: smallest unknown Hadamard matrix
has n = 668.
- pg. 110, line 12: "b >= v - r + 1" should be "b >= v + r - 1".
- pg. 120, problem 5.5 (a): "(7,4,3)-BIBD" should be "(8,4,3)-BIBD". [Jenny Diemunsch spotted
this also.]
- pg. 127, line 7: "Theorem 6.1" should be "Theorem
6.10". [Jeremy Doan caught this one.]
- pg. 154, problem 6.6: Part (a) "Prove that m <= 2n" should be "Prove that 2m <= n". Part (b)
"and m <= (s+1)n." should be "and (s+1)m <= n." [Cathy Erbes spotted this.]
- pg. 160: Lemma 7.10 and Corollary 7.11 are identical statements.
- pg. 166, line 8: "3 <= v <= v_0" should be "3 <= v < v_0".
- pg. 168, line -15: "4 <= v <= v_0" should be "4 <= v < v_0".
- pg. 239, line 8: in the statement of the theorem,
the 2 in the bound should be inside the floor function
(the proof does not work when M is even)
- pg. 240, line 13: "\epsilon = 2..." should be
"\epsilon = d ..."
- pg. 241, line -13: "Theorem" should be "Lemma"

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