Language, Proof and Logic

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The ability to reason is fundamental to human beings. Whatever the discipline or discourse it is important to be able to distinguish correct reasoning from incorrect reasoning. The consequences of incorrect reasoning can be minor, like getting lost on the way to a birthday party, or more significant, for example launching nuclear missiles at a flock of ducks, or permanently losing contact with a spacecraft.

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The fundamental question that we will address in this course is “when does one statement necessarily follow from another” — or in the terminology of the course, “when is one statement a logical consequence of another”. This is an issue of some importance since an answer to the question would allow us to examine an argument presented in a blog, for example, Language, Proof, and Logic to decide whether it really demonstrates the truth of the conclusion of the argument. Our own reasoning might also improve since we would also be able to analyze our own arguments to see whether they really do demonstrate their conclusions.

In this course, you will be introduced to the concepts and techniques used in logic. We will start right from the beginning, assuming no prior exposure to this or similar material, and progress through discussions of the proof and model theories of propositional and first-order logic.

All learners receive a complete textbook and software package ($55.00 value).

We will proceed by giving a theory of truth, and of logical consequence, based on a formal language called FOL (the language of First-Order Logic). We adopt a formal language for making statements since natural languages (like English, for example) are far too vague and ambiguous for us to analyze sufficiently. Armed with the formal language, we will be able to model the notions of truth, proof, and consequence, among others.

While logic is technical in nature, the key concepts in the course will be developed by considering natural English statements, and we will focus on the relationships between such statements and their FOL counterparts. The goal of the course is to show how natural English statements and arguments can be formalized and analyzed.

Language, Proof and Logic

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