IHUM Visions of Mortality

IHUM Visions of Mortality - IHUM Visions of Mortality logic...

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IHUM Visions of Mortality 9/24/07 - logic is not rhetoric - Death is sometimes bad for the person who dies. - Lucretius believes that only two components of the world are atoms and void - There is no right and wrong - 1) What did it matter where X lays once X is dead? o (QUESTION, neither true or false). o Some ambiguities: Eg. Matter to whom or what? What does ‘X lays’ mean? IsX laying there or just X’s body? - 2) For any place P and any dead person X, it does not matter if X is in P. o Answer to (1) along with some instances of universal claim in (2). o What’s the argument for this? 9/26/07 Readings: Lucretius Book 1: lines 1-264, 329-369, 418-450, 503-614 Logic (1) If I’m a nice guy, I won’t actually shoot students in my examples. (2) I’m a nice guy I wont actually shoot students in my examples. (1) If I’m a nice guy, I won’t actually shoot students in my examples. (2) I will actually shoot students in my examples. I’m not a nice guy - Logic is the basis of mathematics. - CRITERION OF VALIDITY: It is NECESSARY that (If all the premises are true, then the conclusion is true.) - EQUIVALENT STATEMENT OF CRITERION OF VALIDITY: it is not possible that (all the premises - V is a valid argument if and only if it is not possible that (all the premises of V are true and the conclusion of V is false). Argument 1: George Bush is the President of the US (P) and grass is green (R). Therefore, Visions of Mortality is a great course (S). Truth of premises and truth of conclusion does not make argument valid. Argument 2: George Bush is the President of the US and grass is green. Therefore, George Bush is the President of the US. Example: I went outside and I opened my umbrella. Argument 3: George Bush is the President of the US and grass is orange. Therefore, George Bush is the President of the US. VALID Argument 4: George Bush is the President of the US and grass is orange. Therefore, grass is orange. INVALID Only beginning in complete truth can guarantee ending in truth III. Overview
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Lucretius: (L) Death is never bad for the person who dies. A. If all there is is atoms and the void, then were just atoms and the void. B. IF we’re just atoms and the void, then death is the permanent end of the existence of the person who dies. C. If death is the permanent end of the existence of the person who dies, then death is never bad for the person who dies. D. All there is is atoms and the void. Trying to get to (D). Book 1: 329-69: Void exists. Book 1: 418-29: Matter exists. Book 1: 430-82: Nothing exists except matter, void (and their properties). 1. 503-10: Matter and void exclude eachother. I. 511-19, 532-7: Ordinary objects are compounds of matter and void. IF a body is divisible, it must contain void. 1. 520 GETS YOU TO D B. (i) if my soul and the rest of my body are separated from each other, then my soul and the rest of my body are both destroyed Example of one argument. Book 1 lines 159-173 (1) If things could be created from nothing, then any kind of thing could be produced from any source. (premise) (2) If any kind of thing could be produced form any source, then nothing needs a seed. (premise) (3) It is not the case that: nothing needs a see. (premise)
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