Symmetrise pairs of indices

Question

Is it possible to use the asym command to symmetrise under a pair-wise exchange of indices?

A_{a b c d} = A_{c d a b}

I tried for example:

asym(ex, \${a b}, {c d}$, antisymmetric=False);

But the kernel crashes (I'm on jupyter).

Answer 1

As shown in the manual, https://cadabra.science/manual/TableauSymmetry.html, you could use the property TableauSymmetry

A_{a b c d}::TableauSymmetry( shape={2,2}, indices={0,2,1,3} );

Cheers.