Geodesic
On $PTC$-noninvariant Lagrangians
Teoretičeskaâ i matematičeskaâ fizika, Tome 9 (1971) no. 1, pp. 91-93 
W. I. Fushchych. On $PTC$-noninvariant Lagrangians. Teoretičeskaâ i matematičeskaâ fizika, Tome 9 (1971) no. 1, pp. 91-93. http://geodesic.mathdoc.fr/item/TMF_1971_9_1_a6/
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     author = {W. I. Fushchych},
     title = {On $PTC$-noninvariant {Lagrangians}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     year = {1971},
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     number = {1},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1971_9_1_a6/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

With the aid of the energy sign and helicity operators the Poincaré-noninvariant Lagrangians and the equations of motion are constructed, which are not invariant under the $PTC$-transformation.

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