On April 22, 2024 11:20:58 PM PDT, "'B. Wilson' via Metamath" 
<metamath@googlegroups.com> wrote:

>It looks suspiciously close to A e. _V which reas as "A is a set", but in this
>case the V is just floating. What are the semantics here?
>

It functions much like A e. _V would. A proof using this theorem can always 
plug in _V for V but it also could plug in On, RR, or whatever is convenient. 
Perhaps looking at <https://us.metamath.org/mpeuni/elex.html> makes it clear.

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