Lecture #4 - Philosophy 12A Lecture #4 Introduction to the...

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Philosophy 12A Lecture #4 1/28/10 Introduction to the Syntax of the LSL: The Lexicon The syntax of LSL is simple. o Upper case letter ‘A’, ‘B’. .which stand for basic sentences o Five sentential connectives/operators (one unary, four binary) Always group when there are two or more connectives Object Language (LSL) and Meta-Language English and all symbols of LSL and lower-case letters (p,q) are meta-variables o Arithmetic: 1,2,3 +,-, = 1+2 = 3 but you can also have a meta-language to describe the arithmetic language: If p > 0, then p+q>q Instead of numbers, we have complex sentences we turn into variables Object language does not have scare quotes or corner quotes More on Use/Mention and ‘’ versus o False because when ‘’ mean you are only talking about the exact symbol. P and q are not a part of LSL because you are merely mentioning p and q. Can’t substitute into ‘’ because the variable is no longer
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Lecture #4 - Philosophy 12A Lecture #4 Introduction to the...

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