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Proofgold Proof

pf
Let x0 of type ο be given.
Let x1 of type ο be given.
Assume H0: x0 ⟶ not x1.
Assume H1: not x0 ⟶ x1.
Apply xm with x0, exactly1of2 x0 x1 leaving 2 subgoals.
Assume H2: x0.
Apply exactly1of2_I1 with x0, x1 leaving 2 subgoals.
The subproof is completed by applying H2.
Apply H0.
The subproof is completed by applying H2.
Assume H2: not x0.
Apply exactly1of2_I2 with x0, x1 leaving 2 subgoals.
The subproof is completed by applying H2.
Apply H1.
The subproof is completed by applying H2.
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