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? -- ======================================================================= USMAIL: Guangliang He | INTERNET: ghe at PHYSICS.ORST.EDU Department of Physics | BITNET: hegl at ORSTVM.BITNET Weniger Hall 301 | Oregon State University | Corvallis, OR 97331-6507 | PHONE: (503) 737-4631 =======================================================================