# PHI 201, Introductory Logic

## Spring 2006

Professor Hans Halvorson
E-mail: hhalvors
Phone: 8-1494
Office hour: TBA, in Marx Hall, Room 210.

Assistants in Instruction.

 _ at princeton Office (1879 Hall) Office Hours Lara Buchak lbuchak ? TBA Mark Budolfson mbudolfs 126 TBA Su Kim sukim ? TBA Juan Srodek jsrodek 227 TBA Cecilia Tilli ctilli 114 TBA

Prerequisites. None

Required Textbook. E. J. Lemmon, Beginning Logic. ISBN: 0915144506. Available from the U Store among other places.

Optional Reading. If you find Lemmon's text to be too terse, then we recommend Paul Tomassi's book Logic as an additional study aid. (Note: Different logic textbooks use different formal systems, and so not just any such text will be helpful in studying for this course.)

Course Description. A person makes an "argument" when they make a claim and try to back that claim up with some evidence. In other words, an argument consists of a claim and some reasons that are supposed to support the claim. Of course, you make and evaluate arguments all of the time, and probably with a good amount of skill. But in this class we step back and ask: what makes a good argument? What principles should we employ to discriminate between good and bad arguments?

To keep things simple, we focus first on deductive arguments -- where the premises of the argument are supposed to "entail" its conclusion. Due to some remarkable progress made in the 20th century, we now have a simple and elegant formal characterization of good deductive arguments. In this course, you will learn the details of this characterization, and you will learn to use it to extend your skill and confidence at making and evaluating arguments.

Course Objectives. If you successfully complete this course, then ...

• You will be able to judge with complete confidence whether an argument is good or bad, based on its underlying logical form. (In order to do this, you will also need to be able to uncover the logical form of sentences in English.)
• When an argument is good, you will be able to show this by producing a proof.
• When an argument is bad, you will be able to show this by demonstrating that its premises are consistent with the negation of its conclusion.

Lectures. Tues & Thurs, 10:00-10:50am in Friend Center, Room 101.