PHIL 110 Lecture Notes - Lecture 6: Sentence Clause Structure
16 Mar 2017
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Dr mc"s philosophy 110 (1171) notes 4#1 . Expressions such as p q are not sentences, but instead are sentence form. That"s because they are composed of sentence variables (and logical connectives) not sentences or sentence constants. In order for a sentence to be a substitution instance of a sentence form each occurrence of the same variables in the sentence form must be replaced by the same sentence or sentence constant. True (a) or false (b): every sentence is a substitution instance of the sentence form p. If we replace p with ~a, and q with b, we get ~(~avb) Compound sentences are substitution instances of more than one sentence. Every sentence, no matter how complex, is a substitution instance of p. Every compound sentence will be a substitution instances of one of these five forms: The main connective of the sentence and form must be the same. A sentence"s expanded form shows all of its logical form.
