Remarks on central extensions of the Galilei group in 2+1 dimensions
Y. Brihaye, S. Giller, C. Gonera, P. Kosinski
Abstract
Some properties of central extensions of 2+1 dimensional Galilei group are discussed. It is shown that certain families of extensions are isomorphic. An interpretation of new nontrivial cocycle is offered. A few bibliographical remarks are included.
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