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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
.
Apply H1 with
λ x3 x4 .
x0
=
x3
.
The subproof is completed by applying H0.
■