tests/testthat/_snaps/tensor_symbols.md

In ricci: Ricci Calculus

creating d works

Code
  d(3)(i, j)
Condition
  Error in `d()`:
  ! Argument `...` constains index with invalid position.
  x Index `j` is lowered while it should be raised.
  i The generalized Kronecker delta requires the first half of indices to be lowered, and the second half to be raised. If other index structures are required, lower/raise them explicitely using a metric tensor, e.g. via `ricci::r()`, or `ricci::l()`.

Code
  d(3)(i, j, k)
Condition
  Error:
  ! Wrong number of indices.
  x Number of indices: 3.
  i The Kronecker delta only accepts an even number of indices.

creating e works

Code
  e(+i, j)
Condition
  Error in `e()`:
  ! Argument `...` constains index with invalid position.
  x Index `i` is raised while it should be lowered.
  i The Levi-Civita epsilon can only have lower indices. If raised indices are required, raise them explicitely using a metric tensor, e.g. via `ricci::r()`.

ricci documentation built on Sept. 9, 2025, 5:56 p.m.