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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]]
…