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MathGroup Archive 1989

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Tensor operations in Mathematica

  • To: Mathematica Mailling list <mathgroup at yoda.ncsa.uiuc.edu>
  • Subject: Tensor operations in Mathematica
  • From: uunet!nucthy.PHYSICS.ORST.EDU!ghe (Guangliang He)
  • Date: Mon, 30 Oct 89 22:17:20 PST

In Mathematica, Inner[f, u, v, g] contracts the last index of tensor u
and first index of tensor v. But how can I contract 2 indexes of a rand
r tensor T to get a rank (r-2) tensor? When r=2, that is just the trace
of the matrix. But how about higher rank tensor?

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