Search for blocks/addresses/...
Proofgold Proof
pf
Let x0 of type
ι
be given.
Let x1 of type
ι
be given.
Apply iffEL with
x1
∈
prim3
x0
,
∃ x2 .
and
(
x1
∈
x2
)
(
x2
∈
x0
)
.
The subproof is completed by applying UnionEq with
x0
,
x1
.
■