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Operators for sets and topology

1

I wrote operations for sets and topology: - `Set.power_set`: returns a power set of a given set - `Set.intersection`: returns an intersection of given sets, rather than two sets -...

yudukikun5120

Currently, `Math.Enum.mean/1` requires two passes to calculate the mean of the `Enumerable`. This commit changes the function to require only a single pass by using `Enum.reduce/3` to calculate a running-mean.

emptytuple-ex