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Formal Logic

3.26  ·  Rating Details ·  47 Ratings  ·  5 Reviews
The first beginning logic text to employ the tree methoda complete formal system of first-order logic that is remarkably easy to understand and usethis text allows students to take control of the nuts and bolts of formal logic quickly, and to move on to more complex and abstract problems.

The tree method is elaborated in manageable steps over five chapters, in each of whic

Hardcover, 198 pages
Published December 31st 1981 by Ingram (first published October 1967)
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Jan 26, 2014 Amber rated it did not like it  ·  review of another edition
Compared to other logic texts I have read, this one is horrifying. It's miserable at best if used as intended as an introductory text.

It would be okay for people already very familiar with logic concepts, and only as a refresher. In the first chapter, I struggled trying to understand his points despite this being my third class on the subject. I had never heard of truth trees before reading this for a logic class, and I had to use outside sources just to get a semblance of what he was talking a
Sep 02, 2013 Kenneth rated it really liked it  ·  review of another edition
Shelves: philosophy
I have to admit that I wasn't excited about the methodology of Jeffrey's system. I've always used natural deduction systems (mostly Forbes) to check validity of arguments. The biggest problem was that you could show validity but harder to show invalidity. With Jeffrey's use of trees you can quickly show an argument to be valid or invalid and also quickly create a counterexample. Using this method takes some getting used to for one who is used to the scores of rules and sequents needed needed for ...more
Jul 26, 2009 Chris rated it liked it  ·  review of another edition
I took logic before this book became the textbook for symbolic logic at vcu. I have to say, I did not like the LPL text, and from what I read of this, it was overly technical for an introductory logic course. There are other textbooks in Logic that effectively explain the same inference rules, laws, definitions, and concepts just as well, whilst avoiding over technicality *when it is unnecessary*. Sometime I get the hunch that Logician-text-book-writers are either sincerely writing the logic tex ...more
Aug 16, 2007 Chauncey is currently reading it  ·  review of another edition
This book is interesting because it introduces and makes extensive use of "truth trees." These devices are really easy to understand and use. They allow one to check for validity and invalidity at once. So they are like truth tables. However, unlike truth tables, truth trees are adequate for checking arguments involving quantifiers. Another virtue of the trees is that they allow easy demonstrations of completeness and soundness. Thus, the book is able to get very, very far in a short space. It's ...more
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