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Proofgold Proof
pf
Let x0 of type
ι
be given.
Apply proj0_ap_0 with
x0
,
λ x1 x2 .
setsum
x1
(
ap
x0
1
)
⊆
x0
.
Apply proj1_ap_1 with
x0
,
λ x1 x2 .
setsum
(
proj0
x0
)
x1
⊆
x0
.
The subproof is completed by applying pair_eta_Subq_proj with
x0
.
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