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(Solved): c_(i)=\sum_(j=1)^3 \sum_(k=1)^3 \epsi _(ijk)a_(j)b_(k) Of course a\times a is zero if a is a vector ...
c_(i)=\sum_(j=1)^3 \sum_(k=1)^3 \epsi _(ijk)a_(j)b_(k)
Of course a\times a is zero if a is a vector whose components are numbers, but not zero
if it is an operator such as L.\epsi _(ijk).