INCIDENCE GEOMETRY
Acknowledgements Introduction
Construction of Incidence and Coset Geometries
Construction of an Incidence Geometry
Construction of a Coset Geometry
Elementary Invariants
Conversion Functions
Residues
Truncations
Shadows
Shadow Spaces
Automorphism Group and Correlation Group
Properties of Incidence Geometries and Coset Geometries
Intersection Properties of Coset Geometries
Primitivity Properties on Coset Geometries
Diagram of an Incidence Geometry
C-Groups
C^ +-Groups
Bibliography
Introduction
Construction of Incidence and Coset Geometries
Construction of an Incidence Geometry
IncidenceGeometry(G) : GrphUnd -> IncGeom
Example IncidenceGeometry_Constructors (H155E1)
Example IncidenceGeometry_Constructors (H155E2)
Example IncidenceGeometry_Constructors (H155E3)
Example IncidenceGeometry_Constructors (H155E4)
Construction of a Coset Geometry
CosetGeometry(G, S, I) : GrpPerm, Set, Set -> CosetGeom
CosetGeometry(G, S) : GrpPerm, Set -> CosetGeom
Example IncidenceGeometry_Constructors (H155E5)
Example IncidenceGeometry_Constructors (H155E6)
Example IncidenceGeometry_Constructors (H155E7)
Elementary Invariants
Points(D) : IncGeom -> SetIndx
Types(D) : IncGeom -> SetIndx
Types(C) : CosetGeom -> SetIndx
Rank(D) : IncGeom -> RngIntElt
Rank(C) : CosetGeom -> RngIntElt
IncidenceGraph(D) : IncGeom -> GrphUnd, GrphVertSet, GrphEdgeSet
Group(C) : CosetGeom -> GrpPerm
MaxParabolics(C) : CosetGeom -> SetIndx
MinParabolics(C) : CosetGeom -> SetIndx
Borel(C) : CosetGeom -> GrpPerm
Kernel(C) : CosetGeom -> GrpPerm
Kernels(C) : CosetGeom -> SeqEnum
Quotient(C, K) : CosetGeom, GrpPerm -> CosetGeom
Conversion Functions
IncidenceGeometry(C) : CosetGeom -> IncGeom
CosetGeometry(D) : IncGeom -> BoolElt, CosetGeom
Graph(D) : IncGeom -> GrphUnd
Graph(C) : CosetGeom -> GrphUnd
Example IncidenceGeometry_Constructors (H155E8)
Residues
Residue(D, f) : IncGeom, Set -> IncGeom
Residue(C, f) : CosetGeom, Set -> CosetGeom
Truncations
Truncation(D, t) : IncGeom, Set -> IncGeom
Truncation(C, t) : CosetGeom, Set -> CosetGeom
Shadows
Shadow(D, I, F) : IncGeom, Set, Set -> SetIndx
Shadow Spaces
ShadowSpace(D,I) : IncGeom, Set -> Inc
Automorphism Group and Correlation Group
AutomorphismGroup(D) : IncGeom -> GrpPerm
CorrelationGroup(D) : IncGeom -> GrpPerm
Properties of Incidence Geometries and Coset Geometries
IsFTGeometry(D) : IncGeom -> BoolElt
IsFTGeometry(C) : CosetGeom -> BoolElt
IsFirm(X) : IncGeom -> BoolElt
IsThin(X) : CosetGeom -> BoolElt
IsThick(X) : CosetGeom -> BoolElt
IsResiduallyConnected(X) : IncGeom -> BoolElt
IsGraph(D) : IncGeom -> GrphUnd
IsGraph(C) : CosetGeom -> GrphUnd
Intersection Properties of Coset Geometries
HasIntersectionPropertyN(C,n) : CosetGeom, RngIntElt -> BoolElt, BoolElt
HasIntersectionProperty(C) : CosetGeom -> BoolElt
HasWeakIntersectionProperty(C) : CosetGeom -> BoolElt
Primitivity Properties on Coset Geometries
IsPrimitive(C) : CosetGeom -> BoolElt
IsWeaklyPrimitive(C) : CosetGeom -> BoolElt
IsResiduallyPrimitive(C) : CosetGeom -> BoolElt
IsResiduallyWealyPrimitive(C) : CosetGeom -> BoolElt
IsLocallyTwoTransitive(C) : CosetGeom -> BoolElt
LocallySArcTransitive(C) : CosetGeom -> RngIntElt
Diagram of an Incidence Geometry
Diagram(D) : IncGeom -> GrphUnd, GrphVertSet, GrphEdgeSet
Example IncidenceGeometry_diagram (H155E9)
Example IncidenceGeometry_diagram (H155E10)
Example IncidenceGeometry_diagram (H155E11)
Example IncidenceGeometry_diagram (H155E12)
C-Groups
HasIntersectionProperty(G) : GrpPerm -> BoolElt
HasStringProperty(G) : GrpPerm -> BoolElt
IsCGroup(G) : GrpPerm -> BoolElt
IsStringCGroup(G) : GrpPerm -> BoolElt
CosetGeometryFromCGroup(G) : GrpPerm -> CosetGeom
CosetGeometryToCGroup(D) : CosetGeom -> GrpPerm
CoxeterDiagram(G) : GrpPerm -> GrphUnd
Example IncidenceGeometry_cosetgeometrytocgroup (H155E13)
Example IncidenceGeometry_cgrouptocosetgeometry (H155E14)
C^ +-Groups
HasIntersectionPropertyPlus(G) : GrpPerm -> BoolElt
CosetGeometryFromCPlusGroup(G) : GrpPerm -> CosetGeom
BDiagram(G) : GrpPerm -> GrphUnd
Example IncidenceGeometry_cgrouptocosetgeometry (H155E15)
Bibliography
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