Basic Ideas and Tools a) ~(Av~B) b) (D&~G)v(G&D) c) [(DV~~B)&(DVB)]&(DVB) d) L&Mv[~N&(MV-L)]} 1-6

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Basic Ideas and Tools a) ~(Av~B) b) (D&~G)v(G&D) c) [(DV~~B)&(DVB)]&(DVB) d) L&Mv[~N&(MV-L)]} 1-6. RULES OF FORMATION AND RULES OF VALUATION We can summarize many important points discussed so far by giving ex- plicit rules which tell us what counts as a sentence of sentence logic and how to determine the truth values of compound sentences if we are given the truth values of the components: Formation Rules i) Every capital letter 'A', 'B', 'C' . . . is a sentence of sentence logic. Such a sentence is called an Atomic Sentence or a Sentence Letter. ii ) If X is a sentence of sentence logic, so is (~X), that is, the sentence formed by taking X, writing a '~' in front of it, and surrounding the whole by parentheses. Such a sentence is called a Negated Sentence.