[GiNaC-list] Tricky way to control over dummy indices

[esarcush esarcush]

Dear all,

in expression

{
indexed(A, i, j) * indexed(B, j, k)
}

GiNaC is saying that the dummy index is "j" and "i, k" are free. Is
there a way to determine dummy indices based on Einstein summation
notation; namely all the indices in the latter be free.

All the bests,
Esa