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Proofgold Proof
pf
Let x0 of type
ο
be given.
Let x1 of type
ο
be given.
Assume H0:
and
(
not
x0
)
(
not
x1
)
.
Assume H1:
or
x0
x1
.
Apply H0 with
False
.
Assume H2:
not
x0
.
Assume H3:
not
x1
.
Apply H1 with
False
leaving 2 subgoals.
Assume H4:
x0
.
Apply H2.
The subproof is completed by applying H4.
Assume H4:
x1
.
Apply H3.
The subproof is completed by applying H4.
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