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SumOverSetf


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Description

Summary

A sum over a set: sum(f(x), x in S) is the sum of f(x) over the members
x of S, each counted once. A binder, like Summationf, whose
range is a set rather than two bounds, and so has no index and no order: the sum over
the roots of a polynomial is sum(f(w), w in { w : p(w) = 0 }), which needs no
first root.
https://github.com/asc-community/AngouriMath/issues/1285

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