I don't understand the axiom of regularity.

let x = {1, 2}
Alright then in particular x != {}
and so there must be a y in x such that y /\ x ={} ?
how do I intersect 1 with {1,2}?

>>16706156 (OP)
1 is also a set, specifically the set { { } }.

>>16706172
Who in their right mind thinks the number 1 is a vagina?