We should eventually merge this: https://github.com/sympy/sympy/pull/9112
The TensorArray object is a multi-dimensional array with valence markings. It could be linked to the differential geometry module, to replace lists of lists of lists of lists. On Monday, 19 October 2015 16:31:37 UTC+2, Ondřej Čertík wrote: > > On Mon, Oct 19, 2015 at 7:59 AM, Imran Ali <imrana...@gmail.com > <javascript:>> wrote: > > > > > > On Saturday, October 17, 2015 at 8:49:28 PM UTC+2, Francesco Bonazzi > wrote: > >> > >> > >> > >> On Saturday, 17 October 2015 17:52:38 UTC+2, Imran Ali wrote: > >>> > >>> > >>> But this result does not correspond to the hand calculations of Thomas > >>> Moore : > >>> > >> > >> Do you know that unlike matrices tensors don't have defined components? > I > >> mean, you may vary their valence (i.e. raise and lower the indices), > and > >> you'll get different components. > >> > >> I did not verify it by hand, but I guess that if you raise the first > index > >> of Thomas Moore's Riemann tensor, you'll get the output by SymPy. > > > > > > Ah of course! He has calculated the covariant form of the > > Riemann-Christoffel tensor. > > > Perfect. Does everything work as expected then? > > If you find further possible problems, please let us know. > > Ondrej > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/5c7b62f2-e87f-4adb-81f7-4b5a64bebde9%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
