Question about moments of inertia tutorial

[Chronum94]

In the moment of inertial regression tutorial found here , shouldn't it be 1 otimes 1 = 0 oplus 1 oplus 2? Since the moment of inertial tensor is a rank 2, 1 otimes 1 tensor?

The part in the example which I think might be a typo:

In the code example, this is correctly done since we have:

    cg = e3x.so3.clebsch_gordan(max_degree1=1, max_degree2=1, max_degree3=2)  # Shape (4, 4, 9).
    y = jnp.einsum('...l,nml->...nm', x, cg[1:, 1:, :])  # Shape (..., 3, 3).

Is there a typo in the text, or am I misunderstanding something (very possible since I'm new to a lot of this)?

[OUnke]

Thank you for bringing this to our attention (and sorry for the delayed reply). You are correct, this is a typo! In an earlier version, we used a different notation using double struck digits not for the degree of the irrep, but for the number of components it has (i.e., 0 would have been written as 1, 1 would have been written as 3 etc.). I will push a fix for the documentation.