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Proofgold Proof
pf
Let x0 of type
ι
be given.
Apply Repl_Empty with
λ x1 .
(
λ x2 .
SetAdjoin
x2
(
Sing
2
)
)
x1
,
λ x1 x2 .
binunion
x0
x2
=
x0
.
The subproof is completed by applying binunion_idr with
x0
.
■