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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.

4 votes
2 answers
53 views

Reorder indices alphabetically in each term of a sum

Here is a challenge for you. I have an expression that has an arbitrary number of terms that look like expression = a[i] * f[g[y, i]] + b[i, j] * f[g[x, j], g[y, i]] …
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