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COXETER GROUPS

 
Acknowledgements
 
Introduction
      The Normal Form for Words
 
Constructing Coxeter Groups
 
Operations on Coxeter Groups
 
Properties of Coxeter Groups
 
Operations on Words
 
Reflections
 
Constructing Coxeter Groups from Existing Coxeter Groups
 
Braid Groups
 
Related Structures
 
Bibliography







DETAILS

 
Introduction

      The Normal Form for Words

 
Constructing Coxeter Groups
      CoxeterGroup(GrpFPCox, M) : Cat, AlgMatElt -> GrpFPCox
      Example GrpFPCox_ContructFromMatrix (H86E1)
      CoxeterGroup(GrpFPCox, N) : Cat, MonStgElt -> GrpFPCox
      IrreducibleCoxeterGroup(GrpFPCox, X, n) : Cat, MonStgElt, RngIntElt -> GrpFPCox
      Example GrpFPCox_ConstructByName (H86E2)
      CoxeterGroup(GrpFPCox, R) : Cat, RootSys -> GrpFPCox
      CoxeterGroup(GrpFPCox, W) : Cat, GrpPermCox -> GrpFPCox, Map
      CoxeterGroup(GrpFPCox, W) : Cat, GrpMat -> GrpFPCox

 
Operations on Coxeter Groups
      IsCoxeterIsomorphic(W1, W2) : GrpFPCox, GrpFPCox -> BoolElt
      Example GrpFPCox_CoxeterIsomorphism (H86E3)
      CartanName(W) : GrpFPCox -> List
      CoxeterDiagram(W) : GrpFPCox ->
      Example GrpFPCox_NamesAndDiagrams (H86E4)
      CoxeterMatrix(W) : GrpFPCox -> AlgMatElt
      CoxeterGraph(W) : GrpFPCox -> GrphUnd
      Rank(W) : GrpFPCox -> RngIntElt
      NumberOfPositiveRoots(W) : GrpFPCox -> RngIntElt
      BasicDegrees(W) : GrpPermCox -> RngIntElt
      Example GrpFPCox_BasicDegrees (H86E5)

 
Properties of Coxeter Groups
      IsFinite(W) : GrpFPCox -> BoolElt
      IsAffine(W) : GrpFPCox -> BoolElt
      IsHyperbolic(W) : GrpFPCox -> BoolElt
      IsCompactHyperbolic(W) : GrpFPCox -> BoolElt
      IsIrreducible(W) : GrpFPCox -> BoolElt
      IsSimplyLaced(W) : GrpFPCox -> BoolElt
      Example GrpFPCox_Properties (H86E6)

 
Operations on Words
      W ! [i_1,...,i_m] : GrpFPCox, SeqEnum[RngIntElt] -> GrpFPCoxElt
      Identity(W) : GrpFPCox -> GrpFPCoxElt
      w1 eq w2 : GrpFPElt, GrpFPElt -> BoolElt
      w1 * w2 : GrpFPCoxElt, GrpFPCoxElt -> GrpFPCoxElt
      w ^ n : GrpFPCoxElt, RngIntElt -> GrpFPCoxElt
      # w : GrpFPCoxElt -> RngIntElt
      Example GrpFPCox_WordArithmetic (H86E7)
      LongestElement(W) : GrpFPCox -> SeqEnum
      CoxeterElement(W) : GrpFPCox -> SeqEnum
      CoxeterNumber(W) : GrpFPCox -> SeqEnum
      Example GrpFPCox_SpecialWords (H86E8)
      LeftDescentSet(W, w) : GrpFPCox, GrpFPCoxElt -> {}
      RightDescentSet(W, w) : GrpFPCox, GrpFPCoxElt -> {}
      Example GrpFPCox_DescentSets (H86E9)

 
Reflections
      IsReflection(w) : GrpCoxElt -> BoolElt, ., ., RngInt
      Reflections(W) : GrpFPCox -> GrpFPCoxElt
      Example GrpFPCox_Reflections (H86E10)

 
Constructing Coxeter Groups from Existing Coxeter Groups
      DirectSum(W1, W2) : GrpPermCox, GrpPermCox -> GrpPermCox
      Example GrpFPCox_SumDual (H86E11)

 
Braid Groups
      BraidGroup(W) : GrpFPCox -> GrpFP, Map
      PureBraidGroup(W) : GrpFPCox -> GrpFP, Map
      Example GrpFPCox_BraidGroups (H86E12)

 
Related Structures
      CoxeterGroup(GrpPermCox, W) : Cat, GrpFPCox -> GrpPermCox
      CoxeterGroup(W) : Cat, GrpFPCox -> GrpPermCox

 
Bibliography