5 . ▁ ▁Each ▁check ' s ▁mem o ▁field ▁ident ifies ▁the ▁book ▁and ▁page ▁number . ▁ 1 . 2 3 ▁indicates ▁an ▁error ▁on ▁page ▁ 2 3 ▁of ▁Volume ▁ 1 . ▁( 1 . 2 3 ) ▁indicates ▁a ▁valuable ▁suggestion ▁on ▁that ▁page . ▁The ▁symbol ▁ Θ ▁denotes ▁the ▁book ▁Things ▁a ▁Computer ▁Scient ist ▁R are ly ▁Tal ks ▁About , ▁K LR ▁denotes ▁the ▁book ▁Mathemat ical ▁Writing ▁( by ▁Kn uth , ▁Lar ra be e , ▁and ▁Roberts ), ▁G K P ▁and ▁C M ▁denote ▁the ▁book ▁Con crete ▁Mathemat ics ▁( by ▁Graham , ▁Kn uth , ▁and ▁Pat ash nik ), ▁f 1 ▁denotes ▁fasc icle ▁ 1 , ▁C MT ▁denotes ▁the ▁book ▁Computer ▁Modern ▁Type faces , ▁D T ▁denotes ▁the ▁book ▁Digital ▁Typ ography , ▁SN ▁denotes ▁Sur real ▁Num bers , ▁C WE B ▁denotes ▁the ▁book ▁The ▁C WE B ▁System ▁of ▁Struct ured ▁Document ation , ▁DA ▁denotes ▁the ▁book ▁Selected ▁Pap ers ▁on ▁Design ▁of ▁Alg orithms , ▁F G ▁denotes ▁the ▁book ▁Selected ▁Pap ers ▁on ▁Fun ▁and ▁Games , ▁and ▁MM ▁denotes ▁the ▁book ▁MM IX ware ▁- ▁A ▁R IS C ▁Computer ▁for ▁the ▁Third ▁Mill en ni um . ▁ ▁Del ays ▁Kn uth ▁is ▁often ▁unable ▁to ▁answer ▁immediately ▁when ▁a ▁reader ▁finds ▁a ▁mistake ▁in ▁one ▁of ▁his ▁books ▁or ▁programs . ▁In ▁some ▁cases , ▁the ▁delay ▁has ▁been ▁several ▁years . ▁For ▁example ,