Geodesic
On internal symmetries of the Dirac equation in graphene
Problemy fiziki, matematiki i tehniki, no. 2 (2011), pp. 11-14.

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The internal symmetries of massless and massive Dirac equations in space-time $2+1$ are investigated. It is shown that the massless Dirac equation has 12-parameter symmetry group which as a subgroup contains 10-parameter group Lee $\mathrm{SO}(3,2)$. The massive equation $(m \ne 0)$ has the symmetry group $\operatorname{SO}(2,2)$.
Keywords: internal symmetry, Dirac field, generators, invariance.
Mots-clés : group 
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P. P. Andrusevich; V. A. Pletyukhov; V. I. Strazhev. On internal symmetries of the Dirac equation in graphene. Problemy fiziki, matematiki i tehniki, no. 2 (2011), pp. 11-14. http://geodesic.mathdoc.fr/item/PFMT_2011_2_a1/

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