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Proofgold Proof
pf
Let x0 of type
ι
be given.
Let x1 of type
ι
be given.
Let x2 of type
ι
be given.
Assume H0:
x0
⊆
x1
.
Assume H1:
x1
⊆
x2
.
Let x3 of type
ι
be given.
Assume H2:
x3
∈
x0
.
Apply H1 with
x3
.
Apply H0 with
x3
.
The subproof is completed by applying H2.
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