You might be looking 
for 
https://doc.sagemath.org/html/en/reference/tensor_free_modules/sage/tensor/modules/tensor_with_indices.html

On Tuesday, April 9, 2024 at 6:59:27 AM UTC-7 Anton Todorov wrote:

> Einsum: https://numpy.org/doc/stable/reference/generated/numpy.einsum.html
>
> It is a way to define multiple operations on arrays of arbitrary shape. 
> I've not seen anything that suggests this is implemented in sagemath, but I 
> was hoping there might be something hidden.
>
> What I need this for is to calculate symbolic results of array operations 
> which are too cumbersome to represent as matrix operations.
>

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