[GiNaC-list] Indexed vs labelled

[Alejandro Limache]

It seems that my last email got chopped so I am resending it,
sorry...

>>Q4. "Indices" of various kinds proved to be useful in different areas of
>>mathematics, e.g. linear algebra.
>
>>Q5. I need expressions of the type \sum_{j=1}^n a_j b_j for an unspecified
>>symbolic value n and quantities a_j and b_j *labelled* (rememberring that
>>_indexed_ is already copyrighted) by j in this range.
>
I have the same type of concern.