FURTHER CORRECTIONS TO THE PLEASURES OF
COUNTING
T. W. K
¨
ORNER
Richard Hardwick points out that on page X, email and http have
changed from pmms to dpmms.
(TWK says, whoops!
this should
certainly have been corrected in the reprint, but was not.)
He also points out that on page 270 the formula
at
2
+
bt
+
c
=
a
(
t
+
b/a
)
2
+
c
−
b
2
/
4
a
2
.
should read
at
2
+
bt
+
c
=
a
parenleftbigg
t
+
b
2
a
parenrightbigg
2
+
c
−
b
2
4
a
2
.
Hans Schneebeli points out that the last sentence of Exercise 8.2.3
(i) on page 170 is completely wrong and must be replaced by:
Show that if
g
′
(
x
)
>
0 for

x
 ≤
a
, then
g
(
−
a
)
< g
(
a
) and that if
g
′
(
x
)
<
0 for

x
 ≤
a
, then
g
(
a
)
< g
(
−
a
).
Bruce Atwood gently points out to me that even when I wrote Section
17.4 WHO was already starting a campaign to eradicate polio. There
should certainly be a note of this perhaps on page 446.
Page 53 Tom Oldfield notes that I should replace
θ
1
−
θ
2
(which is
negative) by
θ
2
−
θ
1
(which is positive) where ever it occurs.
Page 58 side note.
Anders Mjelde has found a written source in
‘Pursuit  The Chase and Sinking of the Bismarck’ (1974) Ludovic
Kennedy though it suggests human rather than machine error.
Page 389 Side note to last sentence.
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 Fall '08
 Groah
 Math, Counting, Home Page, T. W. KORNER

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