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Question: GRTensor III problem with defining tensors with contracted indices

Question:GRTensor III problem with defining tensors with contracted indices

Area51 15 Maple 2017
October 13 2019
2

Hi.

Im working with GRtensor iii package for Maple.

The goal is to obtain values of specific product of the Ricci tensor and scalar function in FRW spacetime together with second order covariant derivative acting on this product. .

grdef(

After i defined general 2 covariant derivatives acting on that product

 grdef( 

I have errors when i want to define contracted forms of this expression/tensor:

grdef(

which should be scalar quantity (fY*Rab );ab

grdef(

and this should have only 2 lower indices ac

Hovewer i obtain errors for both cases
Error, (in grtensor:-grdef) lhs/rhs index conflict.

grtensor_v2.mw
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