First-order language of SET THEORY ⟨02,07⟩—optional

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A brief overview of the FOL of set theory, which includes the special two-place predicate '∈', so that

a ∈ b

is to be read 'a is an element of b'. For instance, suppose a = 4 and b = the set {1, 2, 3, 4}. Then a ∈ b is true.
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I still don't understand how Rayos number gets so big

RichardCranium.