Geodesic
Central extensions of the Poincaré group
Teoretičeskaâ i matematičeskaâ fizika, Tome 22 (1975) no. 3, pp. 422-424 Cet article a éte moissonné depuis la source Math-Net.Ru

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The group $\widetilde{\mathrm{Ext}}(A,\mathscr P_+^\uparrow)$ of analytical central extensions of the Poincaré group by the arbitrary connected abelian Lie group is found. 
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     author = {V. V. Khrushchev},
     title = {Central extensions of the {Poincar\'e} group},
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}
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V. V. Khrushchev. Central extensions of the Poincaré group. Teoretičeskaâ i matematičeskaâ fizika, Tome 22 (1975) no. 3, pp. 422-424. http://geodesic.mathdoc.fr/item/TMF_1975_22_3_a14/

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