| 
                                    
                                        gptkbp:instanceOf
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:algebra
                                        
                                         
                                    
                                        
                                            gptkb:Lie_group
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:automorphismGroup
                                    
                                 | 
                                
                                    
                                        
                                            
                                            diagram automorphism
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:category
                                    
                                 | 
                                
                                    
                                        
                                            
                                            category O
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:centralTo
                                    
                                 | 
                                
                                    
                                        
                                            
                                            one-dimensional
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:characterizedBy
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:generalized_Cartan_matrix
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:class
                                    
                                 | 
                                
                                    
                                        
                                            
                                            twisted
                                        
                                        
                                         
                                    
                                        
                                            
                                            untwisted
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:containsModule
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Verma_module
                                        
                                         
                                    
                                        
                                            gptkb:Fock_space_module
                                        
                                         
                                    
                                        
                                            gptkb:Wakimoto_module
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:Dynkin_diagram
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:affine_Dynkin_diagram
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:hasApplication
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:vertex_operator_algebras
                                        
                                         
                                    
                                        
                                            
                                            integrable systems
                                        
                                        
                                         
                                    
                                        
                                            
                                            modular forms
                                        
                                        
                                         
                                    
                                        
                                            
                                            soliton equations
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:hasCasimirElement
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Sugawara_construction
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:hasCentralElement
                                    
                                 | 
                                
                                    
                                        
                                            
                                            central charge
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:hasCoxeterNumber
                                    
                                 | 
                                
                                    
                                        
                                            
                                            affine Coxeter number
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:hasDerivation
                                    
                                 | 
                                
                                    
                                        
                                            
                                            degree operator
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:hasDual
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Langlands_dual_affine_Lie_algebra
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:hasKillingForm
                                    
                                 | 
                                
                                    
                                        
                                            
                                            degenerate
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:hasProperty
                                    
                                 | 
                                
                                    
                                        
                                            
                                            infinite-dimensional
                                        
                                        
                                         
                                    
                                        
                                            
                                            symmetrizable
                                        
                                        
                                         
                                    
                                        
                                            
                                            graded
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:hasQuantumDeformation
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:quantum_affine_algebra
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:hasSubalgebra
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Heisenberg_algebra
                                        
                                         
                                    
                                        
                                            
                                            Cartan subalgebra
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:hasWeightLattice
                                    
                                 | 
                                
                                    
                                        
                                            
                                            affine weight lattice
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:introduced
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Victor_Kac
                                        
                                         
                                    
                                        
                                            gptkb:Robert_Moody
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:notableExample
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:affine_A_n
                                        
                                         
                                    
                                        
                                            gptkb:affine_D_n
                                        
                                         
                                    
                                        
                                            gptkb:affine_E8
                                        
                                         
                                    
                                        
                                            gptkb:affine_G2
                                        
                                         
                                    
                                        
                                            gptkb:affine_sl(2)
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:relatedTo
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Virasoro_algebra
                                        
                                         
                                    
                                        
                                            
                                            finite-dimensional simple Lie algebras
                                        
                                        
                                         
                                    
                                        
                                            
                                            central extension
                                        
                                        
                                         
                                    
                                        
                                            
                                            loop algebras
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:represents
                                    
                                 | 
                                
                                    
                                        
                                            
                                            highest weight representation
                                        
                                        
                                         
                                    
                                        
                                            
                                            integrable representation
                                        
                                        
                                         
                                    
                                        
                                            
                                            level k representation
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:studiedIn
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:mathematics
                                        
                                         
                                    
                                        
                                            gptkb:theoretical_physics
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:subclassOf
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Kac–Moody_algebra
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:type
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:affine_root_system
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:usedIn
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:quantum_field_theory
                                        
                                         
                                    
                                        
                                            gptkb:string_theory
                                        
                                         
                                    
                                        
                                            
                                            representation theory
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:Weyl_group
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:affine_Weyl_group
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:bfsParent
                                    
                                 | 
                                
                                    
                                        
                                            gptkb:Igor_Frenkel
                                        
                                         
                                    
                                        
                                            gptkb:affine_Dynkin_diagrams
                                        
                                         
                                    
                                        
                                            gptkb:extended_Dynkin_diagrams
                                        
                                         
                                    
                                        
                                            gptkb:vertex_operator_algebras
                                        
                                         
                                    
                                        
                                            gptkb:Kac–Moody_algebras
                                        
                                         
                                    
                                        
                                            gptkb:Kac–Peterson_formula
                                        
                                         
                                    
                                        
                                            gptkb:Kac–Wakimoto_character_formula
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        gptkbp:bfsLayer
                                    
                                 | 
                                
                                    
                                        
                                            
                                            8
                                        
                                        
                                         
                                    
                                 | 
                            
                        
                            
                                | 
                                    
                                        https://www.w3.org/2000/01/rdf-schema#label
                                    
                                 | 
                                
                                    
                                        
                                            
                                            affine Lie algebras
                                        
                                        
                                         
                                    
                                 |