×

### Let's log you in.

or

Don't have a StudySoup account? Create one here!

×

### Create a StudySoup account

#### Be part of our community, it's free to join!

or

##### By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

by: Gianni Kunde

9

0

29

# INTRO TO LOGIC PHIL 1021

Gianni Kunde
LSU
GPA 3.55

J. Roland

These notes were just uploaded, and will be ready to view shortly.

Purchase these notes here, or revisit this page.

Either way, we'll remind you when they're ready :)

Get a free preview of these Notes, just enter your email below.

×
Unlock Preview

### Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

COURSE
PROF.
J. Roland
TYPE
Class Notes
PAGES
29
WORDS
KARMA
25 ?

## Popular in PHIL-Philosophy

This 29 page Class Notes was uploaded by Gianni Kunde on Tuesday October 13, 2015. The Class Notes belongs to PHIL 1021 at Louisiana State University taught by J. Roland in Fall. Since its upload, it has received 9 views. For similar materials see /class/223073/phil-1021-louisiana-state-university in PHIL-Philosophy at Louisiana State University.

×

## Reviews for INTRO TO LOGIC

×

×

### What is Karma?

#### You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 10/13/15
Introduction to Logic 66 Argument Forms and Fallacies PHIL 1021 PH L 1021 ntroducmon to Logwc Definition 661 Definition Argument Form An argument form is an arrangement ofstatement variables and operators such that uniform substitution of statements for statement variables results in an argument PHiL 1021 introduction to Logic Common Argument Forms Some patterns or forms of argument are fairly easy to recognize as valid or invalid and common enough that they have been given names Here are some common valid argument forms PHlL 1021 introduction to Logic pvq Np I W wa H Hypothetical Syllogism HS OQ O U UU w WQ PH L 1021 ntroducmon to Logwc Dq i Np Constructive Dilemma CD p3qorDs er qu PH L 1021 ntroducmon to Logwc Destructive Dilemma DD p3qorDs NqVNS NpVNr PH L 1021 ntroducmon to Logwc Terminology for Dilemmas The conjunctive premise of a dilemma constructive or destructive is called the horns of the dilemma PHlL 1021 introduction to Logic Resisting Dilemmas o Constructive Dilemma and Destructive Dilemma occur so frequently in various types of debates that specific strategies for resisting them have been developed PHlL 1021 introduction to Logic Resisting Dilemmas o Constructive Dilemma and Destructive Dilemma occur so frequently in various types of debates that specific strategies for resisting them have been developed 9 We can39t resist them by attacking their logic because they39re valid So we must attack their soundness PHlL 1021 introduction to Logic Resisting Dilemmas o Constructive Dilemma and Destructive Dilemma occur so frequently in various types of debates that specific strategies for resisting them have been developed 9 We can39t resist them by attacking their logic because they39re valid So we must attack their soundness o Arguing that the conjunctive premise is false is known as grasping the dilemma by the horns PHlL 1021 lntroduction to Logic Resisting Dilemmas o Constructive Dilemma and Destructive Dilemma occur so frequently in various types of debates that specific strategies for resisting them have been developed 9 We can39t resist them by attacking their logic because they39re valid So we must attack their soundness o Arguing that the conjunctive premise is false is known as grasping the dilemma by the horns o Arguing that the disjunctive premise is false is known as escaping between the horns of the dilemma PHlL 1021 lntroduction to Logic Resisting Dilemmas o Constructive Dilemma and Destructive Dilemma occur so frequently in various types of debates that specific strategies for resisting them have been developed We can39t resist them by attacking their logic because they39re valid So we must attack their soundness o Arguing that the conjunctive premise is false is known as grasping the dilemma by the horns o Arguing that the disjunctive premise is false is known as escaping between the horns of the dilemma o If the disjunctive premise is a tautology we have no choice but to grasp the dilemma by the horns at least if we wish to resist it PHlL 1021 lntroduction to Logic Strategy for Resisting a Dilemma 0 Consider the disjunctive premise If it is a tautology grasp the dilemma by the horns by arguing against one of the conjuncts of the conjunctive premise PHiL 1021 introduction to Logic Strategy for Resisting a Dilemma 0 Consider the disjunctive premise If it is a tautology grasp the dilemma by the horns by arguing against one of the conjuncts of the conjunctive premise 9 Otherwise try to either 2a escape between the horns of the dilemma by finding an alternative to the disjuncts of the disjunctive premise that excludes those disjuncts or 2b grasp the dilemma by the horns whichever seems most promising PHlL 1021 introduction to Logic Common Argument Forms continued The following are common invalid argument forms PH L 1021 ntroducmon to Logwc Denying the Antecedent DA qu Np Nq PH L 1021 ntroducmon to Logwc Affirming the Consequent AC qu PH L 1021 ntroducmon to Logwc Bewa re Denying the Antecedent and Affirming the Consequent are particularly important owing to their affinity with modus ponens and modus folens This affinity often leads people to mistakenly think that Denying the Antecedent and Affirming the Consequent are valid argument forms PHlL 1021 introduction to Logic Notice a Every substitution instance of a deductively valid argument form is a deductively valid argument PHiL 1021 introduction to Logic Notice a Every substitution instance of a deductively valid argument form is a deductively valid argument 0 A deductively invalid argument form can have both deductively valid and deductively invalid substitution instances See pp 366 367 for discussion and an example PHlL 1021 lntroduction to Logic Convention 661 Convention An argument is said to have a deductivey invalid argument form if it is a substitution instance ofa deductivey invalid argument form and ii it is not also a substitution instance ofa deductivey valid argument form PH L 1021 lntroducmon to Logic Some Guidelines Hurley offers some guidelines to use in determining whether or not an argument A has a valid or invalid form After symbolizing A if it39s not already symbolized we should keep in mind four points PHlL 1021 introduction to Logic Some Guidelines continued o The order of premises does not affect the form of an argument PHiL 1021 introduction to Logic Some Guidelines continued a The order of premises does not affect the form of an argument 9 Compound statements including negated statements may be substituted for statement variables in argument forms substitution is not restricted to simple statements PHlL 1021 introduction to Logic Some Guidelines continued a The order of premises does not affect the form of an argument 9 Compound statements including negated statements may be substituted for statement variables in argument forms substitution is not restricted to simple statements p is logically equivalent to NM p Thus one may be substituted for the other in any argument form PHlL 1021 lntroduction to Logic Some Guidelines continued The order of premises does not affect the form of an argument Compound statements including negated statements may be substituted for statement variables in argument forms substitution is not restricted to simple statements p is logically equivalent to NM p Thus one may be substituted for the other in any argument form p V q is logically equivalent to q V p Thus one may be substituted for the other in any argument form PHlL 1021 lntroduction to Logic

×

×

×

### You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

## Why people love StudySoup

Steve Martinelli UC Los Angeles

#### "There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Kyle Maynard Purdue

#### "When you're taking detailed notes and trying to help everyone else out in the class, it really helps you learn and understand the material...plus I made \$280 on my first study guide!"

Steve Martinelli UC Los Angeles

Forbes

#### "Their 'Elite Notetakers' are making over \$1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!
×

### Refund Policy

#### STUDYSOUP CANCELLATION POLICY

All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email support@studysoup.com

#### STUDYSOUP REFUND POLICY

StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here: support@studysoup.com

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to support@studysoup.com

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.