, , , , , ; , [1] , [hide] 1 2 3 4 5 6 7 [ ] , , , , , , , ; , [1] , [hide] 1 2 3 4 5 6 7 [ ] , , , , , , , ; , [1] , [hide] 1 2 3 4 5 6 7 [ ] , , , whilst , , ( , , , ) ( , ', , ') ( , = = 0 coinciding , ) :[2] [3] [4] [5] , , , : , [ ] , [6] , ( , ) , 3 3 : 3 3 [6] , 10 [6] [ ] SGal (3) ( , , 1) 3 , whilst , , ( , , , ) ( , ', , ') ( , = = 0 coinciding , ) :[2] [3] [4] [5] , , , : , [ ] , [6] , ( , ) , 3 3 : 3 3 [6] , 10 [6] [ ] SGal (3) ( , , 1) 3 , whilst , , ( , , , ) ( , ', , ') ( , = = 0 coinciding , ) :[2] [3] [4] [5] , , , : , [ ] , [6] , ( , ) , 3 3 : 3 3 [6] , 10 [6] [ ] SGal (3) ( , , 1) 3 SGal (3) :[7] , , 3 SGal(3) , , , : ( (3) ), , , , , ,, SGal (3) topological ,SGal (3) semidirect ( ) 1. ( 2 )2.3.4.5. [ ] , ; , , ( antisymmetric ),, SGal (3) :[7] , , 3 SGal(3) , , , : ( (3) ), , , , , ,, SGal (3) topological ,SGal (3) semidirect ( ) 1. ( 2 )2.3.4.5. [ ] , ; , , ( antisymmetric ),, SGal (3) :[7] , , 3 SGal(3) , , , : ( (3) ), , , , , ,, SGal (3) topological ,SGal (3) semidirect ( ) 1. ( 2 )2.3.4.5. [ ] , ; , , ( antisymmetric ),, ( Hamiltonian ), ( ), Galileian , ( ) , :[8]imn , 0 /; ( Hamiltonian ), ( ), Galileian , ( ) , :[8]imn , 0 /; ( Hamiltonian ), ( ), Galileian , ( ) , :[8]imn , 0 /; , , () diverging , [ ] , , [9] '', ' ' , , commutes ( ), , , () diverging , [ ] , , [9] '', ' ' , , commutes ( ), , , () diverging , [ ] , , [9] '', ' ' , , commutes ( ),