notes_3_2x2 - Branden Fitelson Philosophy 12A Notes 1...

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Unformatted text preview: Branden Fitelson Philosophy 12A Notes 1 Announcements and Such Todays Music: Steve Earle and Townes Van Zandt If its your first time . . . Grab a syllabus, study the website (especially the handouts and lecture notes), and ask your me or your GSI any questions you have. Sections will meet Monday & Friday (starting tomorrow). Bledin: 13:30 MF. Students AHN LIN. Room: 213 Wheeler. Lawrence: 13:30 MF. Students LIU ZHANG. Room: 130 Wheeler. HW #1 will be given as a quiz in section tomorrow. Ive posted HW #2 (chapters 2&3) due next Thursday (by 4pm). Please consult and follow the HW Tips & Guidelines handout. All HWs will turnedin to the 12A Drop Box (outside 301 Moses). Today: Chapter 2, Continued UCB Philosophy Chapter 2 (Contd) 05/27/10 Branden Fitelson Philosophy 12A Notes 2 Abstract Argument Logical Form LSL / LMPL / LFOL Symbolization Chapters 2 , 5 & 7 English Argument Valid Form? Deciding Formal Validity Chapters 3, 4, 6 & 8 Valid English Argument? Valid Abstract Argument? Articulation of Thought in English UCB Philosophy Chapter 2 (Contd) 05/27/10 Branden Fitelson Philosophy 12A Notes 3 English LSL II: Symbolizing in Two Stages When symbolizing English sentences in LSL (especially complex ones), it is useful to perform the symbolization in (at least) two stages . Stage 1 : Replace all basic sentences (explicit or implicit) with atomic letters. This yields a sentence in Logish (neither English nor LSL). Stage 2 : Eliminate remaining English by replacing English connectives with LSL connectives, and properly grouping the resulting symbolic expression (w/parens, etc .) to yield pure LSL. Here are some simple examples of symbolizations: English: Logish: LSL: Either its raining or its snowing. If Dell introduces a new line, then Apple will also. Snow is white and the sky is blue. It is not the case that Emily Bronte wrote Jane Eyre . John is a bachelor if and only if he is unmarried. Either R or S . If D , then A . W and B . It is not the case that E . J if and only if not M . R S D A W & B E J M UCB Philosophy Chapter 2 (Contd) 05/27/10 Branden Fitelson Philosophy 12A Notes 4 English LSL IV: Symbolizations involving (and ) We will use to symbolize many different English expressions. These will be among the most tricky of our LSL symbolizations. It is very important that you remember these various expressions involving ! [ if p then q [ p q [ p implies q [ p q [ p only if q [ p q [ q if p [ p q [ p is a sufficient condition for q [ p q [ q is a necessary condition for p [ p q [ q provided p [ p q [ q whenever p [ p q [ p is contingent upon q [ p q [ p q is equivalent to [ (p q) & (q p) (so mastering...
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notes_3_2x2 - Branden Fitelson Philosophy 12A Notes 1...

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