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PHIL 220 Lecture note _01 upload.docx

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Department
Philosophy
Course
PHIL 120
Professor
Roberta Ballarin
Semester
Fall

Description
PHIL 220 “only if” precedes the consequence *If you win, then you have a ticket. = Only if you have a ticket, you win. *If you have fire, then you have oxygen. = Only if you have oxygen, you have a fire. These two are same sentences in symbolization. Symbolization no.22 question Alfred will pass only if he concentrates provided that the text is not readable [Ambiguous] 2 types of interpretation (1) Alfred will pass only if he concentrates, provided that the text is not readable. Not readable -> Alfred will pass only if he concentrates (Not readable -> (Alfred passes -> Alfred concentrates)) (2) Alfred will pass, only if he concentrates provided that the text is not readable. Alfred will pass -> Alfred concentrates provided that the text is not readable. Alfred will pass -> (Text is not readable -> Alfred concentrates) 4 rules of building derivations (1) P *** Modus Ponens (MP) P -> Q <= Modus Ponens transmits truth! ________ Q Ordering of the antecedents doesn’t matter *** R (Repeat) : P ----- P *** DN (Double Negation) : ~~ P P ---------or ------ P ~~P *** MT (Modus Tollens) : P -> Q
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