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another question let suppose we take the Lie gorup of [tex]g_ab,\pi_ab[/tex] being g_ab and Pi_ab the metric and momentum density could we obtain the Casimir invariant of this group?....

the last question given the lagrangian of special relativity [tex]{g^1/2}Rdx^4[/tex] how do you calculate the momentum [tex]\pi_ab[/tex] ?...