Logic and Language Models for Computer Science by Henry Hamburger

By Henry Hamburger

this article makes in-depth explorations of a huge diversity of theoretical issues in computing device technology. It plunges into the functions of the summary suggestions so that it will confront and tackle the skepticism of readers, and instill in them an appreciation for the usefulness of conception. A two-part presentation integrates common sense and formal language—both with functions. bankruptcy themes disguise mathematical preliminaries, propositional good judgment, proving issues: why and the way, predicate good judgment, proving with predicates, software verification, good judgment programming, language types for computing device technological know-how, language types, finite automata and their languages, commonplace expressions, Lex: a device for construction lexical scanners, context-free grammars, pushdown automata and parsing, and turing machines. For destiny desktop scientists.

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Further, by modus ponens with p and p -* q, we would know that q = TRUE, contradicting the originally given information, - q. We say the supposition that - p = FALSE is absurd: it is absurd to believe something that leads to a contradiction. Having determined that - p must not be FALSE, we have arrived at (the truth of) - p. Modus tollens: p --- q •q •p These rule names are Latin phrases. Modus means way or in this context a method. Ponens and tollens mean putting and taking away. Imagine that you have p -4 q in a container of truths.

Notice that the truth table definition of p -- q tells us that for it to be false we must have both p = TRUE and q = FALSE. -- 4 Proving a biconditional, p +-> q "*Two-way proof: Use the biconditional law so that there are two main subproofs, one to prove p -- q and one to prove q ---* p. 3. "* Set equality: A theorem that the sets A and B are equal can be rewritten x E A <-* x G B. Since it therefore requires proof of a biconditional, its proof can be viewed as a special case of two-way proof.

We also read the expression p -+ q as "if p then q". This English-language phrasing can be just as confusing as "or" (inclusive vs. exclusive) unless we are careful to remember that, as with the other operators, the definition is the truth table, not the English phrase. Although in English "if p then q" does not seem to mean much when p is false, we have seen that it is useful to have this operator, which 26 CHAPTER 2. PROPOSITIONAL LOGIC is defined to give TRUE in both of the states where p is FALSE.

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