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i need help....

prove SUM(k) [E(ijk)E(lmk)]= d(il)d(jm) - d(im)d(jl)

where "d" is Kronecker delta symbol and "E" is permutation symbol or

Levi-Civita density

prove SUM(k) [E(ijk)E(lmk)]= d(il)d(jm) - d(im)d(jl)

where "d" is Kronecker delta symbol and "E" is permutation symbol or

Levi-Civita density

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