Philosophy 120: Logic Online

Fall Quarter 2007

Instructor: Ed George

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Course Purpose:

With symbolic logic we learn how to take factual statements and represent them in such a way that we may develop deductively valid arguments. We also learn how to test arguments for validity and how to demonstrate step by step that a particular conclusion follows from a set of premises.

By the end of the course you should be able to symbolize statements in both propositional and quantifier logic, use a truth table method to test propositional arguments and other methods to test arguments involving quantifiers, and use a natural deduction system to present proofs, or derivations, in both propositional and quantifier logic. You should also be able to recognize the difference between an argument intended to be deductively valid and other types of reasoning.

Text:

Required

Text:   Patrick J. Hurley, A Concise Introduction to Logic (9th edition, 2005)

Please note that the CD-ROM accompanying the book has a multimedia instructional program for each section of each chapter. In addition, there is a companion site for the text that includes additional aids. In the Web Links I have a link to a set of enhanced podcast lectures from a logic course at UCSD, and those with broadband access may find them helpful. You should become familiar with these resources and use them as needed. I may also post other resouces there.

Note:  You are allowed to use a previous edition of this text, though you may not have the advantage of the CD-ROM.

Course Content:

A.  A short period will be devoted to the first three chapters covering basic terminology.

1.  Reading carefully--recognizing arguments from persuasive appeals.
2.  Argument analysis--premises and conclusions.
3.  Deductive and inductive reasoning.
4.  Valid, Invalid, and Sound arguments.

B.  The remainder of the course will be devoted to covering the basic skills of symbolic logic.

1.  Symbolic Translation.
2.  Truth Tables.
3.  Formal Proofs of Validity (Rules of Inference/Implication and Rules of Replacement)
4.  Conditional and Indirect proofs
5.  Predicate/quantification Logic

Expectations/Requirements:

Please read the following very carefully:

1.  You will be expected to read the assigned portions of the text carefully and attempt to do the assigned problems in each chapter This is crucial, if you wish to master the skills and do well on the quizzes and exams.  You can expect to have to re-read certain sections to insure that you thoroughly understand the concepts. Use of Learning Logic CD and/or the Logic Coach on the companion website are extremely helpful tools and you will be expected to make use of them before attempting the exercises in the text. The advantage of using the tutorials is that you get immediate feedback. So, a flow chart of your activitiy would look like this:

Read assigned chapter/section --> Do tutorial (CD or Logic Coach)-->Work assigned exercise*-->Take quiz

*For each of the assigned exercises you will work those which are starred. The answers are in the back of the book. If you need or wish additional exercises, I can provide the answers for you.

2.  Work regularly. The course material is presented in a step-by-step manner.  Missing one step will mean that you will not be able to understand the next step.  This will lead to a great deal of frustration on your part.  In my experience, the persons who do most poorly in this class are those who get behind in the material.  The best approach it to do a little bit each day. Make sure that you do not go for long periods of time without doing anything related to the class or you will find yourself having to relearn and refamiliarize yourself with the material.

3. Read all my announcements.  I use the announcements as my primary way of communicating with the class..You are expected to read my announcements in order to stay informed.

4. Read and Print the Calendar. Another source of important information for this class is the calendar. It contains dues dates and information about your quizzes and exams. You are responsible for meeting all due dates.

Evaluation:

There will be the following quizzes and exams:

 ten quizzes (20 pts. each)* 20%. one exam on basic concepts and propositional logic 20% an exam covering natural deduction in propositional logic 30% an exam covering predicate logic 30%

*No make-up quizzes will be given. You will be allowed to drop the lowest quiz score, so keep this in mind if you need to go out of town, etc.  Only in extreme circumstances--death in the family, hospitilization, etc.--will you be allowed to make up an exam.

About the Quizzes:

The quizzes are mostly drawn from a test bank associated with the text and will change from quarter to quarter. They are generally multiple-choice in format, and will be graded automatically. You will be allowed to take each quiz three times, with your highest score being recorded. Note: You must get a minimum of 65% correct on any quiz before you will be allowed to take the next quiz*. You will have to do all the quizzes prior to each exam. For example, quizzes 1-3 must be done before you can take Exam I. They will be accessible up to shortly before the due date for the exam, so you can take each whenever you are ready.

*If you score lower than 65% on your first or second attempt, this tells you that you need to go back and work more on the chapter that the quiz covers. If you still are unable to score above 65% by your third attempt, you will need to contact me,

About the Exams:

There will be three exams for the course. The exams will have a more varied format than the quizzes. You may have to apply certain formatting codes so that your answers can be read. I will let you know about these simple codes. You will have only one attempt at each exam. They are not always graded automatically.

Grade will be assigned according to the percentages below:

 Percentage Grade 100-96 A 95-90 A- 89-86 B+ 85-83 B 82-80 B- 79-76 C+ 75-73 C 72-70 C- 69-66 D+ 65-63 D 62-60 D- 59 and below F

A note to Summer Classes

The shortned summer term, 8-weeks, means that the schedule will be compressed from the normal ten week quarter, thus the pace will be much faster.