# lect11 - 1 1 INTRO LOGIC DAY 11 Derivations in SL 3 2...

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Unformatted text preview: 1 1 INTRO LOGIC DAY 11 Derivations in SL 3 2 Review We demonstrate ( show ) that an argument is valid by deriving ( deducing ) its conclusion from its premises using a few fundamental modes of reasoning . 2 3 Rule Sheet available on course web page provided on exams keep it in front of you when doing homework Intro Logic S E N T E N T I A L L O G I C Rules of Derivation &I &O &O &D & & ( & ) : & –––––– –––––– ––––––––– –––––– –––––– & & ∨ I ∨ O ∨ O ∨ D (ID) ∨ ∨ ( ∨ ) : ∨ –––––– –––––– ––––––––– ( ∨ ) ∨ ∨ –––––– –––––– I O O ↔ D ( ) : ↔ ––––––– ––––––– –––––––––– → ––––––– ––––––– → → I see CD O O CD ( ) :...
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lect11 - 1 1 INTRO LOGIC DAY 11 Derivations in SL 3 2...

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