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user 62063
Mathematica symbols are the ultimate atoms of symbolic data. Every symbol has a unique name, exists in a certain Mathematica context or namespace, and can have a variety of types of values and attributes.
5
votes
Accepted
Reorder indices alphabetically in each term of a sum
ClearAll["Global`*"];
indexsort := coeff_*terms_f :> Module[{indices},
indices = Last /@ (List @@ terms);
coeff*terms /. Thread[indices -> Sort[indices]]];
expression = (a[i]*f[g[y, i]]
+ …
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