9 lines
546 B
Markdown
9 lines
546 B
Markdown
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tags:
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- Logic
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- propositional-logic
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- derivation-rules
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---
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Like the [introduction](Negation%20Elimination.md) rule for negation, the elimination rule also works by deriving a contradiction. It is basically *Negation Introduction* in reverse. Instead of starting the subproof with a true proposition from which you derive a contradiction, you start with the negation of a proposition, derive a contradiction and then assert the positive of the negated proposition you started out with.
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