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−2KN<br />
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Σt K = 0 <br />
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K = cste <br />
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DiD i N = N[4π(E + S) + KijK ij ]. <br />
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K = 0 ∇ µ nµ = 0 <br />
Σt <br />
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β i <br />
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D i Dix k = 0. <br />
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ψ γij <br />
fij <br />
fij