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Does anyone know/know where to find the proof of:

$$\epsilon_{ijk}\epsilon_{lmn} = +δ_{il}δ_{jm}δ_{kn} + δ_{im}δ_{jn}δ_{kl} + δ_{in}δ_{jl}δ_{km} −δ_{im}δ_{jl}δ_{kn} − δ_{il}δ_{jn}δ_{km} − δ_{in}δ_{jm}δ_{kl}$$

Thank you much

Garbojax McBruce
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    Are you sure this equality is even right? – MASL Sep 18 '15 at 21:31
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    @MASL: It is a valid formula i think, see https://de.wikipedia.org/wiki/Levi-Civita-Symbol – MrYouMath Sep 18 '15 at 22:15
  • @MrYouMath Thanks. It was also a reminder for Garbojax to show a bit more effort in finding an answer. Garbojax, it is convenient to show what you tried, were you searched and rather ask more specific question like were you are stuck. This usually gives rise to more interesting answers as well. Anyways, welcome to MSE. – MASL Sep 18 '15 at 23:12

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