# Introduction to Logic

## Introduction to Logic

The Principles and Practice of

Reasoning

### Orientation Session

 If space permits, I will add at the end of class today

 Review of Handouts and Course

Website

### While the Roster is Called…

 We have one text (described in the

Course Description), but will also be using a website – more on that later

 This is a skills-oriented class. Assigned or not – plan on using all exercise opportunities you can access (text and website).

### Using the Syllabus

All chapters and sections are from Hurley’s A Concise

Introduction to Logic (10 th Edition)

Come prepared to discuss assigned chapter/sections during the indicated weeks.

It’s easy to forget assignment due dates, especially for the online homeworks.

Create some system for yourself that will keep you on track.

 Homeworks are completed and submitted online

 Quizzes are taken and submitted in class

 Classwork is completed and submitted in class

 A Portfolio is compiled during the semester and is due in June.

### Course Portfolio

Think of this as an ongoing record of your work in this course.

The portfolio will cover three modules – the basics of logic, propositional logic and categorical logic.

It may be submitted electronically (Powerpoint or other web-enabled presentation project) or physically (set of printed pages)

### Course Policies

Lateness:

No late classwork

Late homeworks (done online) are penalized 10% for each day late.

Only one makeup quiz will be offered to those who miss a quiz for documented reasons.

### Course Content

 Hey, we all argue, right?

 The Argument Clinic

Logic deals with a different kind of argument…

### Logical Arguments

 Reasoning is the process of moving toward conclusions on the basis of clear, compelling and relevant supportive statements.

 In much of logic, attention focuses on how we draw conclusions from statements, not on the truth of those statements.

### Discussion: Two Arguments

 Those who oppose same-sex marriage are simply Neanderthals.

 Everybody knows same-sex marriage is a threat to society.

 So, same-sex marriages should be allowed.

 Opposition to same-sex marriage relies on constitutionally suspect reasoning.

 There is no clear evidence that same-sex marriage is a threat to society.

 So, same-sex marriage should be allowed.

### Another Argument

 Any law or policy that limits constitutionally protected freedoms is unacceptable.

 Laws against same-sex marriage limit constitutionally protected freedoms.

 Support for this claim?

 So, laws against same-sex marriage are unacceptable.

 You will have plenty of help

 Classes, of course!

 Professor accessibility

 SOCS 213B – MW, 12 – 1 pm

Online (instant email) – W, 4 – 5 pm

 Website sign-up:

 http://1pass.thomson.com/1pass/

Click "Create My Account“.