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changed names of resource-1.3; added a note on homepage on release
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old-examples/systemS/ex2.txt
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13
old-examples/systemS/ex2.txt
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[ A -> B |- ~ B -> ~ A ]
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------------------------------ Implication strategy
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[ A -> B , ~ B |- ~ A ]
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------------------------------ Negation rewrite
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[ A -> B , ~ B |- A -> _|_ ]
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------------------------------ Implication strategy
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[ A , A -> B , ~ B |- _|_ ]
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------------------------------ Modus ponens
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[ A , A -> B , B , ~ B |- _|_ ]
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------------------------------ Forgetting
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[ B , ~ B |- _|_ ]
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------------------------------ Ex falso quodlibet _|_
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Ø
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