Hypothetical Syllogisms

# Hypothetical Syllogisms - older with ID will be admitted...

This preview shows pages 1–12. Sign up to view the full content.

BLANK Press play to begin…

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
A Night At The Movies Introduction to Modus Ponens and Modus Tollens LOGIC AND CRITICAL THINKING Written by Curtis Peldo, California State University, Chico 1
MODUS PONENS P1. If P then Q P2. P C: Q “If P then Q” is a conditional claim. Conditional claims alone are not arguments. Modus Ponens 2

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
MODUS PONENS P1. If P then Q P2. P C: Q P = Antecedent Q = Consequent P1. If P then Q P1. If P then Q Modus Ponens is the mode of affirming , always affirming the antecedent term of the conditional claim P2. P Modus Ponens 3
MODUS PONENS P1. If P then Q P2. P C: Q Affirming the Consequent P1. If P then Q P2. Q C: P Modus Ponens Formal Fallacy-Invalid Valid 4

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
MODUS TOLLENS P1. If P then Q P2. Not Q C: Not P Modus Tollens Conditional Claim Modus Tollens is the mode of denying, always denying the consequent term of the conditional claim. P1. If P then Q P2. Not Q C: Not P 5
MODUS TOLLENS P1. If P then Q P2. Not Q C: Not P Denying the Antecedent P1. If P then Q P2. Not P C: Not Q Modus Tollens Formal Fallacy-Invalid Valid 6

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
EXAMPLE Only people 17 and

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: older with ID will be admitted. Tickets are required for admission. Sorry, no passes accepted for this film. This film has been rated NC 17 by the Motion Picture Industry. NC 17 No persons under 17 admitted. 7 Fresh Popcorn - with real butter flavoring! Get yours now in the lobby! EXAMPLE P = Are Admitted to film Q = Are 17 or older Affirming the Consequent P1. If P then Q P2. Q C: P P1. If P then Q P2. P C: Q Modus Ponens Formal Fallacy-Invalid Valid 17 or older Have an ID Have a ticket NC 17 8 EXAMPLE P = Are Admitted to film Q = Are 17 or older Formal Fallacy-Invalid Valid P1. If P then Q P2. Not Q C: Not P Denying the Antecedent P1. If P then Q P2. Not P C: Not Q Modus Tollens 17 or older Have an ID Have a ticket NC 17 9 To be continued. .. The Sequel: Part II: Categorical logic End 10...
View Full Document

{[ snackBarMessage ]}

### Page1 / 12

Hypothetical Syllogisms - older with ID will be admitted...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online