Solutions08

# Solutions08 - Chapter 8 Hints and Selected Solutions...

This preview shows pages 1–2. Sign up to view the full content.

Chapter 8: Hints and Selected Solutions Section 8.1 (page 203) 8.1 1. Affirming the consequent is invalid . 4. Weakening the Antecedent invalid . 7. Constructive Dilemma is valid . 8.4 Here is an informal proof of the argument: The unicorn, if horned, is elusive and dangerous. If elusive or mythical, the unicorn is rare. If a mammal, the unicorn is not rare. The unicorn, if horned, is not a mammal. Proof. Assume that the unicorn is horned. We want to prove that it is not a mamal. Assume, by way of a proof by contra- diction, that is is a mamal. By the third premise, the unicorn is not rare. By the first premise, the unicorn is elusive. Bu then by the second premise, the unicorn is rare, after all. This gives us our contradicion, showing us that our assummption is false. 8.7 Here is an informal proof of the argument: b is small unless it’s a cube. If c is small, then either d or e is too. If d is small, then c is not. If b is a cube, then e is not small.

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.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern