Irréfutabilité du tiers exclus
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tests/irrefutabilite-tiers-exclu.8pus
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tests/irrefutabilite-tiers-exclu.8pus
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~~(F \/ ~F)
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intro f.
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cut ~F.
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intro f2.
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cut F \/ ~F.
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assumption.
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right.
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assumption.
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intro f2.
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cut F \/ ~F.
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assumption.
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left.
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assumption.
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