19 lines
503 B
Text
19 lines
503 B
Text
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Type Ctrl-D or 'Exit.' to exit or 'Help.' for help.
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# Set: pp::colors
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Set: pp::unicode
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Proof state:
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a : Bool, b : Bool ⊢ b ⇒ a ∨ b
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## Proof state:
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H : b, a : Bool, b : Bool ⊢ a ∨ b
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## Proof state:
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H : b, a : Bool, b : Bool ⊢ a
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## Proof state:
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H : b, a : Bool, b : Bool ⊢ b
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## Error (line: 8, pos: 0) failed to backtrack
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Proof state:
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H : b, a : Bool, b : Bool ⊢ b
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## Proof state:
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no goals
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## Proved: T2
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# Theorem T2 (a b : Bool) : b ⇒ a ∨ b := Discharge (λ H : b, Disj2 a H)
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#
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