Hi,
How can I manipulate objects with indices?
I need to do things like
a_i + b_i * c_{j+1}
using a TeX style notation (so that in the last term, the index is j
+1)
where i and j are symbolic.
In Mathematica this would be something like
a[i] + b[i] * c[j+1]
but something like that presumably cannot work in Sage, since [] are
reserved for other things!
I then need to be able to manipulate such expressions to act on them
with functions according to the values of different indices in each
term: if there is a product a_i b_i with two equal indices then I need
to apply a different rule than if the indices are different( a_i b_j
with j not equal to i ).
Could somebody please tell me what syntax I need (if indeed this is
possible...)?
Thanks and best wishes,
David.
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