Introduction to Automata Theory, Languages,

and Computation: Errata for the Third Edition

Errata for Third Edition

Errata for Current Edition

"is" needed before the first "undecidable".

Location Problem Reported By Date

Reported

p. 14, l. 18 "Proof" should be "Prove." Jim Diamond 7/26/07

p. 21, l. 15 "x < 4" should be "x = 3" (the statement is actually

true below 3). Walter Hower 5/31/10

p. 53, l. -2 "each block of" should be "any". That is, the block of

five symbols can start anywhere. Sageev Oore 1/22/07

p. 54, l. 11 The string in reverse can have leading 0's. Sageev Oore 1/22/07

p. 64, l. -1

The sentence should begin "Since any of the 2n

subsets of the last n positions could hold 1's and the

others 0's,..."

kevin Montag 4/14/09

p. 65, Fig. 2.15 Label qn-1 is missing from the empty circle. George Tagviashvili 8/4/06

p. 71, l. -1 The NFA's should recognize the sets of strings

ending in one of the strings listed. Markus Klinik 6/1/09

p. 74, Fig. 2.20 State q0 needs an arrow and state q5 needs a star. Juan Carlos Garcia

Ojeda 6/16/11

p. 75, 3 lines

above Sect. 2.5.4 "my" should be "by". Nabeel Alzahrani 1/26/07

p. 77, Example

2.21, l. 2 "an DFA" should be "a DFA". Pierre Flener 1/16/07

p. 83, l. -3 "nervious" should be "nervous". Walter Hower 1/16/08

p. 87, l. 21 Li has at most 2i members.

San

Skulrattanakulchai 3/26/08

p. 88, l. -8, -7 "is a variable, representing" should be "is intended

to represent". Jim Diamond 11/19/07

p. 98, l. 20 Delete "some" before "state q". Pierre Flener 1/16/07

p. 129, title of Fig.

4.1 "longer than" should be "at least as long as".

San

Skulrattanakulchai 3/26/08

p. 136, paragraph

above Closure

Under

Intersection

All occurrences of L should be Leq. San

Skulrattanakulchai 3/26/08

p. 138, Fig. 4.4 Arrow missing from the arc from Start to pr. San

Skulrattanakulchai 3/26/08

p. 140, l. 12 and

14

L(E should be L(E1) on line 12, and L(ER should be

L(E1R) on line 14.

San

Skulrattanakulchai 3/26/08

p. 148, Exercise

4.2.6 (b) and (c) It should be made clear that x is a string.

4/28/08

p. 151, l. 19 "and" should be "an". Steven Bills 4/20/07

p. 170, l. 1 "modifications" should be "relations" Mohammad Alanazi 7/30/06

p. 179, l. -3 Period missing after "symbol". Juan Garcia-Ojeda 2/21/07

p. 186, l. 13ff

The statement about leftmost or rightmost

derivations for sentential forms with variables in

them is not strictly true. You need to redefine a

left/right-most derivation to skip over variables that

are never expanded in the sentential form in

question.

wlodek Drabent 12/11/13

p. 189, l. -3 "classes" should be "class". Pierre Flener and 1/16/07

Tim Nelson

p. 200, l. 6 "elements" should be "items". Pierre Flener 1/16/07

p. 209, l. -1 The grouping of Fig. 5.17(b) is correct, but you

would replace the * by +. Pierre Flener 1/16/07

p. 237, l. 2 "classes" should be "class". Pierre Flener 1/16/07

p. 240, caption of

Fig. 6.7 The second PN should be PF.

Roberto Gonzalez

Cardenete 6/22/09

p. 250, l. 14 x should be w. Giovanni Pighizzini 11/4/08

p. 253, l. 6 "it" should be capitalized at the beginning of the

sentence. Naomi Nishimura 11/17/06

p. 255, l. 12-13 "0

m110

m for some m n" should be "0

n110

m for

some m > n". Andrew P. Black 6/2/10

p. 257, l. -12 "Automata" should be "Automaton". Pierre Flener 1/16/07

p. 270, l. -2, -1 The grammar really is implicit in the table of Fig. 7.1.

All we have to do is collect the productions. Pierre Flener 1/16/07

p. 300, l. 18 There needs to be an a immediately after the arrow. Torben Amtoft 5/28/09

p. 302, l. 19 It is only the remaining question marks that become

"no." Pierre Flener 1/16/07

p. 312, Problem

7.12, l. 6 ``'' should be ``. Hwang, Joonhyung 10/20/07

p. 318, l. 8 of the

box

The restriction "of more than one symbol" is not

necessary and should be deleted. Torben Amtoft 5/28/09

Zack Whyte 11/15/09

p. 328, l. -5 Xn at the end should be Xn-1. Naomi Nishimura 9/13/06

p. 332, l. 14 M replaces the n+1 1's by B's and the B immediately

to their left by 0. The net effect is the same as

Pierre Flener 1/16/07

stated.

p. 342, l. 6 below

Fig. 8.14 The two ID's both need a "1" at the end. Torben Amtoft 5/23/10

p. 354, l. 5 Comma after q0. Naomi Nishimura 11/17/06

p. 363, l. 5 "is" should be "are". David Ramos 10/17/09

p. 369, l. 4 n should be in italics. Naomi Nishimura 11/17/06

p. 374, Ref. 3, l. 2 "verwander" should be "verwandter" and

"Monatschefte" should be "Monatshefte". Pierre Flener 1/16/07

p. 403, l. -9 i1, i3 should be 1, 3. Walter Hower 6/30/10

p. 432, l. -15 "two different" should be "three different". Torben Amtoft 5/28/09

p. 433, last line of

footnote P1 should be P2. Marcus Ramos 6/15/10

p. 440, l. -9 "Theorem 10.5" should be "Theorem 10.4". Mark A. Shirley 11/27/07

p. 443, l. -3 O(n) should be O(p(n)). Giovanni Pighizzini 12/9/08

p. 444, l. -15 Parenthesis needed after "state". Jacob Moon 6/3/10

p. 454, l. 15 "abribtrarily" should be "arbitrarily". Torben Amtoft 5/28/09

p. 455, l. 17 In the basis, "n=1" should be replaced by "n=1 or

n=2". Torben Amtoft 5/28/09

p. 455, l. 20 and

22

The right side of (10.1) needs to have c as a factor.

So does the expression n2-n on l. 22.

Torben Amtoft 5/28/09

p. 480, l. 2 "probem" should be "problem". Torben Amtoft 5/28/09

p. 482, ref. 7 "sorting" should be "sequential search" and the

pages are 265-266. Walter Hower 2/28/11

p. 493, l. -5 F should be E. Wlodek Drabent 12/11/13

p. 494, l. 20 "THe QBF" should be followed by "(11.1)". Wlodek Drabent 12/11/13

p. 517, item 1, l. 1 "the at most" should be "the list of at most". Jacob Moon 6/15/10

Also, thanks to Ioannis Antonellis, David Bao, Jose Brito, Darren Brown, David Brumley, Scott Craig, Michael Dautermann, Carl Eckberg, Ando Emerencia, Gabor Hardy, Rakesh Kumar, Troy Landers, Terry Lewis, Heather Mahaney, Jacob Moon, Juan Morales, Viet-Bang Nguyen, Raviraj Paliwal, Prashant Shah, Jackie Song, Alexei Stanger, Chang-Hsien Tsai, Rod Topor, Chittaranjan Tripathy, Paavo Turakainen, Wang Zirui, Tom Whaley, Jacinth H.T. Wu, and Ivan Zdanov for correcting errors in the posted solutions.