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Is Einstein notation in sage available?

Dear all

I searched here. But I can not find an contented answer. There is a very usable notation in summations simplifying computations inclusive very $\Sigma$.

Is there a way in Sage that I can use this kind of notation? For more information, this notation is worked out in Cadabra.

Is Einstein notation available in sage available?sage?

Dear all

I searched here. But I can not find an a contented answer. There is a very usable notation in summations simplifying computations inclusive very $\Sigma$.

Is there a way in Sage that I can use this kind of notation? For more information, this notation is worked out in Cadabra.