|Dr James J. Ward (NUI, Galway)
||Page 57. Diakonis spelt here with a `k'
rather than the correct `c'. Scribal error.
||Page 25 and throughout. Illiad should be
|Dr Roger Luther
||Page 307. There is a
In the second paragraph, we should define d = b - a and e = c - a (rather than c and d, since c has already been used) so that the equation of the plane then assumes the form r = a + d + e.
Question 5. Correct as far as it goes, but needs a
little helping hand.
For the solutions to be real we should assume in addition that a^2 -b > 0 and a > 0.
If the square roots that result are to be square roots of rational numbers then a^2 - b should also be a perfect square.
||There is a typo in the
solution to Question 4(b) of Exercises 4.4.
||Page 299. First line
of the proof of Theorem 9.3.2 should just read 'The
area of the parallelogram is equal to' (delete `the
absolute value of').
Lengths are, of course, non-negative!
||Page 32. The symbol
for the empty set is actually Norwegian rather than
Danish and its introduction is attributed to the
mathematician Andre Weil (brother of Simone Weil).
||Page 182. Proof of
Lemma 7.2.3. In the displayed formula, on the RHS of
the equals sign the prime should be on the first r(x)
not the second.