Hi cdb experts and a happy new year (hopefully).

Please consider the following code snippet:

```
d = 3
{k,l,m,n}::Indices(rotation, values={1..3}).
\epsilon{#}::EpsilonTensor.
ex := (K_{1})_{m n} e_{1}_{n} = \epsilon_{1 m n} e_{1}_{n};
evaluate(ex, $e_{1}_{1} = 1, e_{1}_{2} = 0, e_{1}_{3} = 0$, rhsonly=True);
```

I am trying to evaluate the simple matrix multiplication `K_1 e_1`

where `K_1`

is the antisymmetric matrix `\epsilon_{1 m n}`

and `e_1`

is the unit vector `[1,0,0]`

.

I get the error `RuntimeError: No Indices property known for indices in EpsilonTensor`

.

On the other hand, if instead of the explicit index `_{1}`

I use a general index `_{l}`

then the calculation works (but it's not what I wanted to calculate):

```
d = 3
{k,l,m,n}::Indices(rotation, values={1..3}).
\epsilon{#}::EpsilonTensor.
ex := (K_{l})_{m n} e_{l}_{n} = \epsilon_{l m n} e_{l}_{n};
evaluate(ex, $e_{1}_{1} = 1, e_{1}_{2} = 0, e_{1}_{3} = 0$, rhsonly=True);
```

Any advice? Thank you!

GPN