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Geometric Algebra for Physicists
Errata
Note that line numbers here do not include the lines between equations and
text.
Notation
p.xiii, para 2, rigourously is ## rigorously in.
Chapter 1
p.1, paragraph 1, properties to should be properties from.
p.18, exercise 1.2, should read (corrections in italics) Demonstrate that the
following define vector spaces:
1. the set of all polynomials of degree less than or equal to n;
2. all solutions of a given linear homogeneous ordinary di#erential equation;
3. the set of all n âm matrices.
p.18, exercise 1.7, the left­hand side of the equation should read
n(n - 1) · · · (n -m+ 1)
1 · 2 · · · m
= n!
(n -m)!m!
.
Chapter 2
p.21, at the end of the figure caption, portait ## portrait.
p.32, line 2. A factor of b is missing in the second line of equation 2.50, which
should read
a(b#c) = (a·b)c - (a·c)b - 1
2
(bac - cab)
= 2(a·b)c - 2(a·c)b + 1
2
(bc - cb)a.
p.33, line 11, generalises ## generalised.
p.46, line 8, R = exp(-B/2) should read R = exp(-B#/2).
p.48, equation (2.133), the rightmost member of the equalities should be Rc,
not cR.
p.51, section 2.8, line 3. # ij ## 2# ij .
1

Chapter 3
p.60, 4th line from the bottom, (3.15) should read (3.17).
Chapter 4
p.85, last line of the second paragraph, doe ## does.
p.87, line 1 should read: The sum runs over every permutation k 1 , . . . , k r of
1, . . . , r, and (-1) # is +1 or -1 as the permutation k 1 , . . . , k r is even or odd
respectively.
p.89, equation (4.24), the binomial coe#cient is written the wrong way up.
p.90, equation (4.25) should read
dim # Gn # =
n
# r=0
dim # G r
n # =
n
# r=0
# n
r
# = (1 + 1) n = 2 n .
p.95, equation (4.60), the first term in the equation should read B(e 1 e 2 · · · e r )
not B(e 1 e 2 · · · r r ).
p.102, equation (4.108), the right­hand side is intended to be a pure scalar, so
the equation should read
A i···jk = #(e k #e j · · ·#e i )A#.
p.110, equation (4.156). There is a factor of I -1 missing from the right­hand
side of the first line.
p.124, exercise 4.2. The equation should read
e i = a i -
i-1
# j=1
a i ·e j
e 2
j
e j .
Chapter 5
p.126, second paragraph, it it not essential should read it is not essential.
p.140, section 5.3.1. An error has arisen due to a change of convention midway
through writing. The derivation was supposed to be for objects receding in
opposite directions. As such, the sign of # 2 in equation (5.72) is wrong and the
equation should read
v 2 = e -# 2 # 1 # 0 /2 # 0 e # 2 #1 # 0 /2 = e -#2# 1 # 0 # 0 .
Following on, equation (5.74) should read
tanh(# 1 + # 2 ) = tanh(# 1 ) + tanh(# 2 )
1 + tanh(# 1 ) tanh(# 2 ) ,
2

and equation (5.75) should read
u # = u 1 + u 2
1 + u 1 u 2 /c 2 .
p.149, the caption for figure 5.7 should read Relativistic visualization of a sphere.
p.153, equation (5.146), the w should be an #.
p.157, text after equation (5.173) should read anticommutes.
Chapter 6
p.168, equation (6.4), the indices on the final # should be the other way round,
# j
i .
p.176, line 6­7 should read by replacing each J i term with 1/h i # i #.
p.177, line 2 should read the magnitudes are h # = 1, h # = # and h z = 1.
p.188, equation (6.116), equation (6.117) and in the text below (6.117), dX k
should read #X k .
p.196, in the text above equation (6.165), `f(x) on the real axis' and |Z| should
read |z|.
p.197, equation (6.171) should read
# #V
dS # = # ## dX = 0.
p.199, equation (6.184) should read
n+ ·## = -n+### = I (n+ I)·## = -In+ ·##.
p.204, equation (6.194) should read
P(A r (x), x) = # A r (x)·I(x) I -1 (x) = A r ·I I -1 , r # n
0 r > n
.
p.212, equation (6.257) should read
R(e i #e j )âA = [D i , D j ]A.
p.224 line 4, the sentence should read Linear materials have the property that
T and E are linearly related by a rank­4 tensor.
p.224 line 19, the notes text should read `and in a series of papers by Garret
Sobczyk'.
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Chapter 7
p.229, line 2, introduce ## introduced.
p.229, final line, inuniting should be two words.
p.238, line 11 just after equation (7.60), should to be ## should be.
p.249, eq. 7.114, argument of the cosine function should be (## - #).
p.253, second line of first paragraph of section 7.4.1, as opposed plane­polarised
## as opposed to plane­polarised.
p.263, line 7, Huygen's ## Huygens'
p.264, figure caption, difraction ## di#raction.
Chapter 8
p.271, the second last sentence should read `since the vector of observables
s = s k # k was formed by rotating the # 3 vector'.
p.272, final line, a range problems ## a range of problems.
p.283, line above section 8.3.1, of the mark ## o# the mark.
p.298, equation (8.193), the final term on the right­hand side should have a
factor of # 0 at the end.
Chapter 9
p.315, in the paragraph after equation (9.24) the second to last sentence should
read: The presence of multiple time coordinates can complicate the evolution
equations in the relativistic theory.
p.338, example 9.6 should read
The # µ operators that act on states in the two­particle relativistic algebra are
defined by:
# µ (#) = 1
2 # # 1
µ ## 1
0 + # 2
µ ## 2
0 # .
Verify that these operators generate the Du#n--Kemmer ring
# µ # # # # + # # # # # µ = # ## # µ + # #µ # # .
Chapter 10
p.368, equation (10.136) should read
B = (P # #L # ) # = (IP )·L = I#PL# 3 .
p.379, equation (10.181), the result should equal sin 2 (#/2).
4

p.384, paragraph 2, the second sentence should read: The group of conformal
rotors, denoted spin + (2, 4), is therefore a four­fold covering of the restricted
conformal group.
p.387, equation (10.210) should read
# r = (r ·r # - r 1 ## 1
0 J - • #)#I# 2 ” ### q ,
p.390, line 4, discussed is ## discussed in.
Chapter 11
p.395, final line, avariety should be two words.
p.405, The claim preceding (11.62) only holds in Lorentzian spaces. In spaces
with 2 or more basis vectors of both signatures, further discrete elements are
required to encode all rotors.
p.407, equation (11.76), the second R 1 should be an R 2 .
p.414, just before equation (11.119), satsisfy is spelt wrong.
p.418, problem 11.5, in the final equation # 2 (a) should read # 2 (b)
Chapter 12
p.427, line 5, the sentence should end with a question mark.
p.427, in the paragraph below equation (12.43), the density in concentrated
should read: the density is concentrated.
Chapter 13
p.469, equation (13.141) should read
g µ = h -1 (e µ ), g µ = • h(e µ ).
p.471, equation (13.148) should read
D µ # = # µ # + 1
2# µ #.
p.471, just above equation (13.152), in should be replaced by is.
p.476, just after equation (13.185), 'see that' is written twice.
p.490, the final line of equation (13.286) should read g µ
#g #
#(R µ# âA).
p.494, equation (13.319) should read
G(# a )·(aDK) = 0,
5

p.494, equation (13.320) should read
D · # G(K) # = —
D· —
G(K) - # a ·G(a·DK) = 0
Chapter 14
p.517, final paragraph of section 14.3.3 is missing a full stop at the end of the
final sentence.
p.523, before equation (14.125), the text should read 'For this we set' instad of
'For this for we set'.
p.563, final line should read . . . Schwarzschild background to the Kerr case.
Index
p.576, Huygen's ## Huygens'
p.578, symmetric fuunction ## symmetric function.
6