 71 76 90
Andre' planes 33—37
Autotopism group 77 90
Classification by Central Collineations 64
Classification by Desarguesian decomposition 41
Desarguesian decomposition 22 41 56
Desarguesian decomposition, and collineations 23 25 39 60 63 65
Desarguesian decomposition, invariant 57
Desarguesian decomposition, unique 57
Elations 91
Elations, group generated by 94
Fixed point free (f.p.f.) groups 69
Foulser's systems  17
Frobenius groups 69
Generalized Andre' planes 26 38 83 104
Generalized Andre' planes, characterizations 85 87 89
Generalized Andre' planes, collineations of 31 84 87 89
Hall planes 104
| Homologies 61
Homologies and Desarguesian Decompositions 63
Homologies, group generated by 78 80
Homologies, orbits of centers 67
Irreducible abelian subgroup 73
Isomorphic nets 12
Isomorphic nets planes 23
Isomorphic nets replacements 13
Linear transformations as multiplications in a field 61
Net, translation 53
p-primitive divisor 63
Reducible abelian subgroup 73
Replaceable nets 8 54
Replaceable nets, constructions involving 8—18 80 92
Replaceable nets, disjoint 7 54 55
Semi-field planes 21 104
SPREAD 5 49
Spread, partial 53
Z-group 71 75
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