Nothing
Code
g_mink_cart(2) %_% .(i, +j)
Condition
Error in `g_mink_cart(2) %_% .(i, +j)`:
! The metric tensor indices cannot be mixed
i Indices either must be all lowered or all raised.
Code
g_eucl_cart(2) %_% .(i, +j)
Condition
Error in `g_eucl_cart(2) %_% .(i, +j)`:
! The metric tensor indices cannot be mixed
i Indices either must be all lowered or all raised.
Code
g_ss(3)
Output
<Covariant metric tensor field> (t, r, ph1)
[,1] [,2] [,3]
[1,] "-(1-1/r)" "0" "0"
[2,] "0" "1/(1-1/r)" "0"
[3,] "0" "0" "r^2*1"
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