11 lines
434 B
Markdown
11 lines
434 B
Markdown
---
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categories:
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- Logic
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tags: [derivation-rules]
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---
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# Negation Introduction
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This is also known as _proof by contradiction_. You start with an assumption declared in a sub-proof. If you can derive a contradiction from this assumption (typically from the introduction of another proposition and its negation), then you are permitted to derive the negation of the auxiliary assumption in the main proof.
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