hAi the subgroup generated by the subset A, page 65 hA,⊕i an Abelian topological group, page 146
α in Chapter 2, an ordered finite subset of the affine space Fm, page 60
α usually a finite subset in a group, page 5
α in Chapter 5, the graph of the functionα, page 148 hαi the subgroup generated by the subset α, page 65
αK for permutation groups, theK-orbit of the vertex α, page 162 αn in a group, the set of alln-term products formed from the
ele-ments ofα, page 5
˜
α the pojection of a subset α of a group into a quotient group, page 117
A the closure of the subset A, page 55 Alt(n) alternating group onn elements, page 168 Alt(X) alternating group on the finite setX, page 168 Aut(Γ) the automorphism group of the graph Γ, page 161 Aut(L) the automorphism group of the groupL, page 108
b a fixed constant used in Definition 1.2.1, Definition 1.2.12 and in the Convention of Section 1.4, page 25
β in Chapter 5, the graph of the functionβ, page 148
βK for permutation groups, theK-orbit of the vertex β, page 162 B the closure of the subset B, page 55
BCP(r) the class of finite groups Gwhich have no section H/K isomor-phic to the alternating group Alt(r+ 1), page 161
bd() the boundary of a set, page 134
cdimb(P, Q) combinatorial dimension of a geometric configuration, page 26 cdimb(S, T) combinatorial dimension of bipartate graph, page 25
CG(A) the centraliser of the subsetAin the group G, page 65
CG(A)0 the connected centraliser ofAinG, it is just the unit component of the centraliserCG(A), page 65
∆ in Chapter 2, upper bound on degrees, page 54
degC(G) the minimum degree of a non-trivial complex representation of the groupG, page 117
deg(F) degree of the multi-valued functionF, page 12 deg(f) degree of a morphismf, page 56
deg(X) the degree of the algebraic setX, page 55 diam(X) diameter of a graph X, page 49
dim(X) dimension ofX, page 31
E in Chapter 4,E denotes a partial envelope of a family of curves, page 134
187
188 List of Symbols
η usually a small positive number in the exponent, like in n2−η, page 24
ε in Chapter 2, the error-margin we allow in the exponents, page 55 (ε, M, δ) a symbol used as in “(ε, M, δ)-spreading”, page 70
(F :A→B) a generalised multi–functionF fromA toB, page 35 (F :A→B) a multi–function F from AtoB, page 34
(Fγ :V →V, γ∈Γ) standard family of multi–functions corresponding to the group Γ acting on the varietyV, page 36
(Ft:A→B, t∈T) family of multi–functions fromAtoB parametrised by the irreducible varietyT, page 34
F an arbitrary field, page 6
F the algebraic closure of the fieldF, page 6
Fm affine space of dimensionmover the algebraically closed field F, page 55
Fp the field with p elements, for some prime p, i.e. the ring of remainder-classes modulop, page 6
Fp the algebraic closure of the fieldFp, page 6
Fq the field with q elements, for some prime power p, page 6 Frobq Frobenius morphism, theq-th power map, page 87
Γ often denotes a family of continuous curves in the plane, page 127 G0 unit component of the algebraic groupG, page 65
Gα the stabiliser of the permutation groupGat the pointα, page 161 G the closure of the setG, page 134
G(F) the subgroup inGof those elements whose matrix entries belong to the fieldF, page 87
G(Fq) the subgroup inGof those elements whose matrix entries belong to the fieldFq, page 87
[G, G] commutator subgroup of the groupG, page 65
Γ in Chapter 6, Γ is a graph, and the groupGacts on Γ, page 161 Γ often denotes a subgroup with nice properties, i.e., a virtually
soluble subgroup, page 52
Γf the graph of the functionf, page 56
γn in a group, the set of alln-term products formed from the ele-ments ofγ, page 102
γ in Chapter 5, the graph of the functionγ, page 148
Γ(G, S) the Cayley graph of the groupGcorresponding to the generating setS, page 49
ΓK for permutation group acting on Γ, the fixpoint set ofK, page 162 γ(t) a member of a family of plane curves, page 130
GL(n,F) the group of invertiblen×nmatrices, whith entries taken from an arbitrary field F, page 6
GL(n, p) the group of invertiblen×nmatrices, whith entries taken from the fieldFp, for some prime p, page 6
GL(n, q) the group of invertiblen×nmatrices, whith entries taken from the fieldFq, for some prime powerq, page 6
GL(n, R) the group ofn×ninvertiblen×nmatrices, whith entries taken from an arbitrary ringR, for example, R =Zor R =BZ/mZ, page 6
List of Symbols 189
GL(V) the group of invertible V → V linear transformations, V must be a vectorspace over any field, page 6
Gσ the fixpoint subgroup of the automorphism σ in the group G, page 87
Gsp special subvariety inG3, page 23
H a constructible family of algebraic sets, page 31 H a family of subgroups in an algebraic group, page 94 H finite point set in the planeR2, page 143
•••H the set of triple lines with respect to the point configurationH, page 143
• • •
H1H2H3 the set of lineslsuch that there exist three distinct points Pi ∈ l∩ Hi fori= 1,2,3, page 144
••C•
D stands for • • •
CCD, page 144
[H, A] ifH is a group andA is aZH-module then [H, A] is their com-mutator, page 118
Hp member of the familyH of algebraic sets, page 31
Ht a member of the family H of subgroups in an algebraic group, page 94
Inn(L) the inner automorphism group of the groupL, for simple groups it coincides withL, page 108
inv(G) the degrees of the “inverse element” morphism g → g−1 of the linear algebraic groupG, page 65
I(P, Q) number of incidences in a geometric configuration, page 26 K in Chapter 2, lower bound on the size of certain finite sets,
page 54
K(G) function field of the multi–functionG, makes sense since G is a variety as well, page 36
K(V) function field of the varietyV, page 36
K[G] in Section 2.12, coordinate ring of a linear algebraic group G, makes sense sinceGis an affine variety as well, page 94
K[V] in Section 2.12, coordinate ring of an affine varietyV, page 94 L often denotes a finite simple group of Lie type, page 49
Lie∗(p) the set of direct products of simple groups of Lie type of charac-teristicp, page 98
Lie∗∗(p) the set of central products of quasi-simple groups of Lie type of characteristicp, page 98
Lt a member of the familyL of lines in a vectorspace, page 94 M in Chapter 2, the length of the products we allow, page 55 µ(α, X) the concentration of the finite setαin the closed set X, page 60 minclass(G) the size of the smallest nontrivial conjugacy class in the group
G, page 173
minclass(S, G) the size of the smallest nontrivial conjugacy class in Gthat intersectsS, page 173
Mt a member of the familyMof subspaces of a vectorspace, page 94 mult(G) the degrees of the multiplication morphism (g, h) → gh of the
linear algebraic groupG, page 65
N in Chapter 2, upper bound on dimensions, page 54
(N,∆, K) symbol used as in “(N,∆, K)-bounded spreading system”, page 69
190 List of Symbols
NG(A) the normaliser of the subsetA in the groupG , page 65 O(. . .) usual big–Oh expression, page 25
Op(G) the maximal normalp-subgroup of a finite groupG, page 98 P often denotes the parameter space of a family, page 31 P often denotes a perfect group, page 99
Qm
α m-fold direct product of the subset α with itself, page 65 Qm
G m-fold direct product of the group Gwith itself, page 65 P SL(n, p) the quotiont group ofSL(n, p) by its centre,qis a prime, page 115 P SL(n, q) the quotiont group ofSL(n, q) by its centre,q is a prime power,
page 115
qσ parameter used to calculate the number of elements in finite simple groups of Lie type, page 87
Reg(Γ) the set of regular points of the algebraic curve Γ, page 147 SF surface in R3 defined by the three-variate polynomial equation
F = 0, page 130
SL(n,F) the group ofn×nmatrices of determinant 1, whith entries taken from an arbitrary fieldF, page 6
SL(n, p) the group ofn×nmatrices of determinant 1, whith entries taken from the fieldFp, for some prime p, page 6
SL(n, q) the group ofn×nmatrices of determinant 1, whith entries taken from the fieldFq, for some prime powerq, page 6
SL(n, R) the group ofn×nmatrices of determinant 1, whith entries taken from an arbitrary ringR, for example, R =Zor R =BZ/mZ, page 6
Sol(G) the soluble radical of the groupG, page 98 τg a morphism from Qm
G toG defined as the product of certain conjugates, page 65
TΓ1,Γ2,Γ3(n) the maximum number of triple points of n+n+n members from the three families Γ1,Γ2,Γ3 of plane curves, page 127 TΓ(n) the maximum number of triple points of n members from the
family Γ of plane curves, page 127
tr(α,Σ) in groups, the trace of the subsetα in the section Σ, page 121 VΓ the vertex set of the graph Γ, page 161
X the closure of the subset X, page 55 Xgen the set of all CC-generators inQdim(G)
X, page 77 Xnongen the complementer set ofXgen, page 77
Y the closure of the subset Y, page 55 Z(G) centre of the group G, page 65
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