Original sentence: It is also the primary letter used in Real Analysis.The lunate epsilon ϵ is not to be confused with the set symbol ∈ or falsely recognized as the lunate version Σ (Sigma)
Edited sentence: The lunate epsilon ϵ is not to be confused with the set symbol ∈ , nor should the miniscule ɛ be confused with the lunate Σ (Sigma)