Here is the Wikipedia entry for Epsilon.

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??? This does not show up on my own seach of epsilion — as this is not “epsilon” but Sigma! (Maybe that “e” in the power series could be an epsilon, which is generally used in math to suggest a small, indeterminate amount that is useful now but intended to be ignored later. Sort of like voters.)
my bad; will fix this
Awesome! new follower here.