The relation between the factor systems of a group and those of an invariant subgroup

1 June 1976

journal article
Published by IOP Publishing in Journal of Physics A: General Physics

Vol. 9 (6) , 855-862
https://doi.org/10.1088/0305-4470/9/6/007

Abstract

The relation between the factor systems of a group and the factor systems of an invariant subgroup is discussed both for PU and for PUA representations. The results are used to discuss the factor systems of a class of magnetic space groups.

Keywords

FACTOR SYSTEMS
SPACE GROUPS
MAGNETIC SPACE
PUA REPRESENTATIONS
INVARIANT SUBGROUP

This publication has 4 references indexed in Scilit:

ON THE COMULTIPLICATORS OF GROUPS OF UNITARY AND ANTIUNITARY OPERATORS
The Quarterly Journal of Mathematics, 1974
PROJECTIVE REPRESENTATIONS OF SPACE GROUPS, IV: ASYMMORPHIC SPACE GROUPS
The Quarterly Journal of Mathematics, 1972
PROJECTIVE REPRESENTATIONS OF SPACE GROUPS II: FACTOR SYSTEMS
The Quarterly Journal of Mathematics, 1970
Unitary representations of group extensions. I
Acta Mathematica, 1958